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w in (-oo:+oo)
-54 = 2*w+6*w+10 // - 2*w+6*w+10
-(2*w)-(6*w)-54-10 = 0
-2*w-6*w-54-10 = 0
-8*w-64 = 0 // + 64
-8*w = 64 // : -8
w = 64/(-8)
w = -8
w = -8
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