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w in (-oo:+oo)
w-(6*w)+4 = -56 // + 56
w-(6*w)+4+56 = 0
w-6*w+4+56 = 0
60-5*w = 0 // - 60
-5*w = -60 // : -5
w = -60/(-5)
w = 12
w = 12
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