-3w+7=w-21

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Solution for -3w+7=w-21 equation: 


w in (-oo:+oo)

7-3*w = w-21 // - w-21

7-3*w-w+21 = 0

28-4*w = 0 // - 28

-4*w = -28 // : -4

w = -28/(-4)

w = 7

w = 7

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