MATH

X-4=3x+12

X=?

please help

asked by Jonathan
  1. Add 4 to both sides
    x = 4 + 3 x + 12
    combine like terms (4 and 12)
    x = 3 x + 16

    posted by Damon
  2. x-4=3x+12
    -12 -12
    x-16=3x
    -x -x
    -16=2x
    x=-8

    posted by Devin
  3. Add 4 to both sides
    x = 4 + 3 x + 12
    combine like terms (4 and 12)
    x = 3 x + 16
    subtract 3 x from both sides
    - 4 x = 16
    divide both sides by - 4
    x = -4

    posted by Damon
  4. Add 4 to both sides
    x = 4 + 3 x + 12
    combine like terms (4 and 12)
    x = 3 x + 16
    subtract 3 x from both sides
    - 2 x = 16
    divide both sides by - 2
    x = -8

    posted by Damon
  5. I get the same answer, Devin.

    posted by Ms. Sue

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