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w in (-oo:+oo)
(2/5)*(w-5) = 10 // - 10
(2/5)*(w-5)-10 = 0
2/5*(w-5)-10 = 0
2/5*(w-5)-10 = 0
2/5*w-12 = 0
2/5*w-12 = 0
2/5*w-12 = 0 // + 12
2/5*w = 12 // : 2/5
w = 12/2/5
w = 30
w = 30
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