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w in (-oo:+oo)
10 = 6*w-(4*w)-2 // - 6*w-(4*w)-2
4*w-(6*w)+2+10 = 0
4*w-6*w+2+10 = 0
12-2*w = 0 // - 12
-2*w = -12 // : -2
w = -12/(-2)
w = 6
w = 6
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