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Math Help - Math problem with one variable

  1. #1
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    Math problem with one variable

    18+6=12w-0

    and

    -7x+21-7

    I really don't know what to do.
    A step to step analysis on even one problem would be very nice... I have 35 problems like this and I really would like a very good example on how to do determine what to do on problems that are like this.
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  2. #2
    MHF Contributor harish21's Avatar
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    Quote Originally Posted by hoiguy1208 View Post
    18+6=12w-0

    and

    -7x+21-7

    I really don't know what to do.
    A step to step analysis on even one problem would be very nice... I have 35 problems like this and I really would like a very good example on how to do determine what to do on problems that are like this.
    Did you try at all?

    Okay the first one goes like this:

    18+6=12w-0

    24 = 12w

    so,

    w = \frac{24}{12} = 2

    Your second question is NOT understandable.

    Is it  -7x+21= 7 ? Please make your post clear.

    Try doing it by yourself and post if you have problems
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by hoiguy1208 View Post
    18+6=12w-0

    and

    -7x+21-7

    I really don't know what to do.
    A step to step analysis on even one problem would be very nice... I have 35 problems like this and I really would like a very good example on how to do determine what to do on problems that are like this.
    Hi hoiguy1208,

    18+6=12w-0

    You need to isolate the variable. This one's fairly easy.
    Just combine the constants on the left and ignore the subtraction of 0 from the right.

    24=12w

    Last step is to divide each side of the equation by 12.

    I must assume that in your second problem you meant to write:

    -7x+21=-7 or -7x+21=7

    I'll guess -7x+21=7

    Subtract 21 from both sides to isolate -7x on the left.

    -7x=-14

    Finally, divide both sides of your equation by -7.
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