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w in (-oo:+oo)
5*(3*w+7) = -85 // + 85
5*(3*w+7)+85 = 0
5*(3*w+7)+85 = 0
15*w+120 = 0
15*w+120 = 0
15*w+120 = 0 // - 120
15*w = -120 // : 15
w = -120/15
w = -8
w = -8
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