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21 February, 02:58

12-6 (w-3) = 3 (-5-3w) + 21

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  1. 21 February, 04:12
    0
    w = - 8

    Step-by-step explanation:

    12-6 (w-3) = 3 (-5-3w) + 21 (expand parentheses)

    12-6 (w) - (-6) (3) = (3) (-5) - (3) (3w) + 21

    12 - 6w + 18 = - 15 - 9w + 21

    -6w + 30 = 6 - 9w (add 9w to both sides)

    -6w + 30 + 9w = 6

    3w + 30 = 6 (subtract 20 from both sides)

    3w = 6 - 30

    3w = - 24 (divide both sides by 3)

    w = - 24 : 3

    w = - 8
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