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w in (-oo:+oo)
3*(6*w+10) = 120 // - 120
3*(6*w+10)-120 = 0
3*(6*w+10)-120 = 0
18*w-90 = 0
18*w-90 = 0
18*w-90 = 0 // + 90
18*w = 90 // : 18
w = 90/18
w = 5
w = 5
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