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w in (-oo:+oo)
w/3 = (2/5)*(w-10) // - (2/5)*(w-10)
w/3-((2/5)*(w-10)) = 0
(-2/5)*(w-10)+w/3 = 0
w/3-2/5*(w-10) = 0
(-2/5*3*(w-10))/3+w/3 = 0
w-2/5*3*(w-10) = 0
12-1/5*w = 0
(12-1/5*w)/3 = 0
(12-1/5*w)/3 = 0 // * 3
12-1/5*w = 0
12-1/5*w = 0 // - 12
-1/5*w = -12 // : -1/5
w = -12/(-1/5)
w = 60
w = 60
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