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w in (-oo:+oo)
w-((1/4)*w) = 30 // - 30
w-((1/4)*w)-30 = 0
w+(-1/4)*w-30 = 0
3/4*w-30 = 0 // + 30
3/4*w = 30 // : 3/4
w = 30/3/4
w = 40
w = 40
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