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w in (-oo:+oo)
3*(9-(5*w)) = -123 // + 123
3*(9-(5*w))+123 = 0
3*(9-5*w)+123 = 0
3*(9-5*w)+123 = 0
150-15*w = 0
150-15*w = 0
150-15*w = 0 // - 150
-15*w = -150 // : -15
w = -150/(-15)
w = 10
w = 10
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