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13 November, 14:52

If 3x+9 = (10+x) then what does x equal?

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  1. 13 November, 15:01
    0
    3x + 9 = 10 + x

    2x + 9 = 10

    2x = 1

    x = 1/2
  2. 13 November, 15:07
    0
    Remember you can do anything to an equation as long as you do it to both sides

    3x+9=10+x

    minus x both sides

    3x-x+9=10+x-x

    2x+9=10+0

    2x+9=10

    minus 9 both sides

    2x+9-9=10-9

    2x+0=1

    2x=1

    divide both sides by 2

    x=1/2
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