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w in (-oo:+oo)
-7 = 6*w-4*w+3 // - 6*w-4*w+3
-(-4*w)-(6*w)-7-3 = 0
4*w-6*w-7-3 = 0
-2*w-10 = 0 // + 10
-2*w = 10 // : -2
w = 10/(-2)
w = -5
w = -5
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