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w in (-oo:+oo)
-(3*w)-7 = 6*w+11 // - 6*w+11
-(3*w)-(6*w)-11-7 = 0
-3*w-6*w-11-7 = 0
-9*w-18 = 0 // + 18
-9*w = 18 // : -9
w = 18/(-9)
w = -2
w = -2
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