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Math Help - linear equation

  1. #1
    Junior Member
    Joined
    Sep 2009
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    linear equation

    Solve the linear equation using any technique:
    3x + 12 = 7x 18


    Name the technique.
    Check.
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  2. #2
    Junior Member
    Joined
    Oct 2009
    Posts
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    Group like terms.

    3x + 7x = -18 - 12

    Simplify.

    10x = -30
    x = -3

    Check by substituting x = -3 back into the original equation.

    3(-3) + 12 = -7(-3) - 18
    -9 + 12 = 21 - 18
    3 = 3 ... correct.
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  3. #3
    Junior Member
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    Thanks for your help!
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