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w in (-oo:+oo)
2-w = 3*w-18 // - 3*w-18
2-w-(3*w)+18 = 0
2-w-3*w+18 = 0
20-4*w = 0 // - 20
-4*w = -20 // : -4
w = -20/(-4)
w = 5
w = 5
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