math

-4c-11=4c+21

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asked by Billy
  1. move similar terms to one side.
    -4c=4c+32

    then subtract 4c to both sides.
    -8c=32

    then divide both sides by -8.
    c=-4

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  2. -4c-11=4c+21

    move constants to one side and variables to the other.
    add -21 to both sides and add +4c to both sides.
    -4c+4c-11-21 = 4c+4c+21-21
    -11-21 = 8c
    combine terms
    -32 = 8c
    divide both sides by 8
    -32/8 = 8c/8
    -4 = c
    Check my work. I always check the answer, too, by substituting into the original. In this case we have
    (-4*-4) - 11 = (4*-4)+21
    +16-11 = -16+21
    +5 = +5
    GOOD. It checks.

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    posted by DrBob222

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