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w in (-oo:+oo)
-(5*w)-4 = -9 // + 9
9-(5*w)-4 = 0
9-5*w-4 = 0
5-5*w = 0 // - 5
-5*w = -5 // : -5
w = -5/(-5)
w = 1
w = 1
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