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w in (-oo:+oo)
-(3*w)-3 = 2*w+7 // - 2*w+7
-(3*w)-(2*w)-7-3 = 0
-3*w-2*w-7-3 = 0
-5*w-10 = 0 // + 10
-5*w = 10 // : -5
w = 10/(-5)
w = -2
w = -2
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