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w in (-oo:+oo)
5*(9-1*w) = 95 // - 95
5*(9-1*w)-95 = 0
5*(9-w)-95 = 0
5*(9-w)-95 = 0
-5*w-50 = 0
-5*w-50 = 0
-5*w-50 = 0 // + 50
-5*w = 50 // : -5
w = 50/(-5)
w = -10
w = -10
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