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w in (-oo:+oo)
6*w+7 = 3*w+37 // - 3*w+37
6*w-(3*w)-37+7 = 0
6*w-3*w-37+7 = 0
3*w-30 = 0 // + 30
3*w = 30 // : 3
w = 30/3
w = 10
w = 10
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