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w in (-oo:+oo)
3*(5*w-8) = 66 // - 66
3*(5*w-8)-66 = 0
3*(5*w-8)-66 = 0
15*w-90 = 0
15*w-90 = 0
15*w-90 = 0 // + 90
15*w = 90 // : 15
w = 90/15
w = 6
w = 6
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