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w in (-oo:+oo)
5*(6*w+7) = 305 // - 305
5*(6*w+7)-305 = 0
5*(6*w+7)-305 = 0
30*w-270 = 0
30*w-270 = 0
30*w-270 = 0 // + 270
30*w = 270 // : 30
w = 270/30
w = 9
w = 9
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