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w in (-oo:+oo)
5*(3*w+2) = 130 // - 130
5*(3*w+2)-130 = 0
5*(3*w+2)-130 = 0
15*w-120 = 0
15*w-120 = 0
15*w-120 = 0 // + 120
15*w = 120 // : 15
w = 120/15
w = 8
w = 8
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