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