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w in (-oo:+oo)
-(2*w)-9 = 3*w+16 // - 3*w+16
-(2*w)-(3*w)-16-9 = 0
-2*w-3*w-16-9 = 0
-5*w-25 = 0 // + 25
-5*w = 25 // : -5
w = 25/(-5)
w = -5
w = -5
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