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w in (-oo:+oo)
2*w+2/3 = (2/5)*w+50/3 // - (2/5)*w+50/3
2*w-((2/5)*w)+2/3-(50/3) = 0
2*w+(-2/5)*w+2/3-50/3 = 0
8/5*w-16 = 0 // + 16
8/5*w = 16 // : 8/5
w = 16/8/5
w = 10
w = 10
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