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w in (-oo:+oo)
5*(3*w+9) = 120 // - 120
5*(3*w+9)-120 = 0
5*(3*w+9)-120 = 0
15*w-75 = 0
15*w-75 = 0
15*w-75 = 0 // + 75
15*w = 75 // : 15
w = 75/15
w = 5
w = 5
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