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w in (-oo:+oo)
65 = (1/5)*(w-(4*10)) // - (1/5)*(w-(4*10))
65-((1/5)*(w-(4*10))) = 0
(-1/5)*(w-40)+65 = 0
65-1/5*(w-40) = 0
65-1/5*(w-40) = 0
73-1/5*w = 0
73-1/5*w = 0
73-1/5*w = 0 // - 73
-1/5*w = -73 // : -1/5
w = -73/(-1/5)
w = 365
w = 365
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