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w in (-oo:+oo)
2 = w+5*w-10 // - w+5*w-10
2-w-(5*w)+10 = 0
2-w-5*w+10 = 0
12-6*w = 0 // - 12
-6*w = -12 // : -6
w = -12/(-6)
w = 2
w = 2
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