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w in (-oo:+oo)
w+10 = 3*w-8 // - 3*w-8
w-(3*w)+8+10 = 0
w-3*w+8+10 = 0
18-2*w = 0 // - 18
-2*w = -18 // : -2
w = -18/(-2)
w = 9
w = 9
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