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-12x+10/5 = - x/20
I can't decide if I should cross multiply by -20 or just 20. The - is in the middle of the x and 20 (like a fraction)
I came up with 2 possible answers:
x=40/49 and x = 40/47

  • algebra - ,

    scroll down, I answered

  • algebra - ,

    The answer I got using a calc is 2

  • sign error - ,

    (-12x+10)(-20)/5 = -x (-20/20)
    I made a sign error here
    48 x -40 = +x
    47 x = 40
    x = 40/47

  • no way I get 2 - ,

    Not for this problem

  • algebra - ,

    Is it (-12x+10) / 5

    Or
    -12x + (10/5)

    ?

  • algebra - ,

    scroll down Matts. I did it both ways.

  • algebra - ,

    I am not a big fan of the expression "cross multiply"
    What you want to do here is multiply both sides, all terms by -20 (or 20 would work too)
    FIRST THE WAY YOU TYPED IT (probably wrong)
    -12(-20) x + 2(-20 ) = -x(-20)
    240 x - 40 = 20 x
    220 x = 40
    x = 2/11
    NOW WHAT I THINK YOU MEAN
    (-12x+10)(-20)/5 = -x (-20/20)
    48 x -40 = -x
    49 x = 40
    x = 40/49
    PARENTHESES ARE IMPORTANT WHEN TYPING EQUATION ON A COMPUTER (because of order of operations)




    typo - Damon, Friday, April 22, 2011 at 8:14pm

    (-12x+10)(-20)/5 = -x (-20/20)
    I made a sign error here
    48 x -40 = +x
    47 x = 40
    x = 40/47

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