21=-3w+6w-6

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Solution for 21=-3w+6w-6 equation: 


w in (-oo:+oo)

21 = 6*w-3*w-6 // - 6*w-3*w-6

6-(-3*w)-(6*w)+21 = 0

3*w-6*w+6+21 = 0

27-3*w = 0 // - 27

-3*w = -27 // : -3

w = -27/(-3)

w = 9

w = 9

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