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w in (-oo:+oo)
137/20 = (3/5)*w-w+7 // - (3/5)*w-w+7
w-((3/5)*w)+137/20-7 = 0
w+(-3/5)*w+137/20-7 = 0
2/5*w-3/20 = 0 // + 3/20
2/5*w = 3/20 // : 2/5
w = 3/20/2/5
w = 3/8
w = 3/8
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