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w in (-oo:+oo)
-10 = 6*w+6*w+2 // - 6*w+6*w+2
-(6*w)-(6*w)-10-2 = 0
-6*w-6*w-10-2 = 0
-12*w-12 = 0 // + 12
-12*w = 12 // : -12
w = 12/(-12)
w = -1
w = -1
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