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Math Help - Brain Teaser

  1. #1
    Newbie Megpup's Avatar
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    Brain Teaser

    What is the value of 3-4/3x + 5 =7



    -4 + 3=x +4

    3-4= -x+6+11x+4x-3

    -3 1/3x - 1/6= 1 1/3
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Megpup View Post
    What is the value of 3-4/3x + 5 =7



    -4 + 3=x +4

    3-4= -x+6+11x+4x-3

    -3 1/3x - 1/6= 1 1/3
    Can I be the first to say

    What???

    Are you trying to solve:
    3 - 4/(3x + 5) =7

    -4/(3x + 5) =4

    -4 = 4(3x + 5)

    -1 = 3x + 5

    3x = -1 - 5 = -6

    x = -2

    -Dan
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  3. #3
    Super Member
    earboth's Avatar
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    Quote Originally Posted by Megpup View Post
    What is the value of 3-4/3x + 5 =7

    -4 + 3=x +4
    3-4= -x+6+11x+4x-3
    -3 1/3x - 1/6= 1 1/3
    Hi,

    I assume that you want to solve
    Code:
          4
    3 - ---- + 5 = 7
         3x
    You'll get:
    Code:
          4
    8 - ---- = 7
         3x
    Subtract 8 on both sides:
    Code:
       4
    - ---- = -1
       3x
    Multiply by (-3x):

    4 = 3x ==> x = 4/3. I really don't understand what you have done - honestly!
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  4. #4
    Bar0n janvdl's Avatar
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    Quote Originally Posted by earboth View Post
    4 = 3x ==> x = 4/3
    Dont u mean x = 3/4 ??

    Isnt it (3/4) * x ??
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  5. #5
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by janvdl View Post
    Dont u mean x = 3/4 ??

    Isnt it (3/4) * x ??
    No.

    4 = 3x

    4/3 = (3x)/3

    4/3 = x

    -Dan
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  6. #6
    Bar0n janvdl's Avatar
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    If only people would use parenthesis...
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