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w in (-oo:+oo)
w-(6*w)+5 = 10 // - 10
w-(6*w)-10+5 = 0
w-6*w-10+5 = 0
-5*w-5 = 0 // + 5
-5*w = 5 // : -5
w = 5/(-5)
w = -1
w = -1
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