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Math Help - Please check my linear equation solution

  1. #1
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    Please check my linear equation solution

    (3x+3)/(x-3)=7
    Foiled the left side to get
    3x-9x+3x-9=7
    multiplied the right side to get
    3x-9x+3x-9=7x-21
    solve
    -3x-9=7x-21
    -3x=7x-12
    -10x=-12
    x=1.2
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  2. #2
    Super Member 11rdc11's Avatar
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    Quote Originally Posted by dtownangel View Post
    (3x+3)/(x-3)=7
    Foiled the left side to get
    3x-9x+3x-9=7
    multiplied the right side to get
    3x-9x+3x-9=7x-21
    solve
    -3x-9=7x-21
    -3x=7x-12
    -10x=-12
    x=1.2

    \frac{3x+3}{x-3} = 7

    3x+3 = 7(x-3)

    3x+3 = 7x-21

    24=4x

    x=6
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  3. #3
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    so where did i go wrong?
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  4. #4
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    ah i just went a more complicated route. probably leading to a mistake
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  5. #5
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    Well, the first step looks a little strange...

    How did you get 3x-9x+3x-9=7 from \frac{(3x+3)}{(x-3)}=7?
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  6. #6
    Super Member 11rdc11's Avatar
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    Quote Originally Posted by dtownangel View Post
    ah i just went a more complicated route. probably leading to a mistake
    You can't foil the left side
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  7. #7
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    yeah i got some ill-advice from a friend.
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