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w in (-oo:+oo)
w-(3*w)+8 = 12 // - 12
w-(3*w)-12+8 = 0
w-3*w-12+8 = 0
-2*w-4 = 0 // + 4
-2*w = 4 // : -2
w = 4/(-2)
w = -2
w = -2
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