Math Help - Math problem with one variable

1. 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.

2. Originally Posted by hoiguy1208
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

3. Originally Posted by hoiguy1208
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.