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Math Help - Decimal Equation help please

  1. #1
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    Decimal Equation help please

    2+0.1(5 - x) = 1.3x - (0.4x - 2.5)

    2+0.5-0.1x = 1.3x-0.4x + 2.5

    10(2+0.5-0.1x) = 10(1.3x=0.4x+2.5)

    20+50-x = 13-4x + 25

    70-x = -4x+38

    32-x=-4x

    32 = -3x

    32/-3 = -3x/-3


    In the back of the book it says the answer is x= 0 but get 32/-3? what am I doing wrong?

    Thank you
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  2. #2
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    Quote Originally Posted by Aristoxenus View Post

    10(2+0.5-0.1x) = 10(1.3x=0.4x+2.5)
    10*.5 = 5 not 50
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  3. #3
    Senior Member abhishekkgp's Avatar
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    Quote Originally Posted by Aristoxenus View Post
    step 1) 2+0.1(5 - x) = 1.3x - (0.4x - 2.5)

    step 2) 2+0.5-0.1x = 1.3x-0.4x + 2.5

    step 3) 10(2+0.5-0.1x) = 10(1.3x=0.4x+2.5)

    step 4) 20+50-x = 13-4x + 25

    step 5) 70-x = -4x+38

    step 6) 32-x=-4x

    step 7) 32 = -3x

    step 8) 32/-3 = -3x/-3


    In the back of the book it says the answer is x= 0 but get 32/-3? what am I doing wrong?

    Thank you
    when you go from step 3 to step 4 there is a mistake. 10(2+0.5-0.1x) should be 20+5-x and not 20+50-x
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  4. #4
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    I need to take a break, thank you!
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  5. #5
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    I cant believe I didnt see that, thank you
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