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w in (-oo:+oo)
(1/3)*(3*w-15)-((1/5)*(25-(5*w))) = 0
(1/3)*(3*w-15)+(-1/5)*(25-5*w) = 0
1/3*(3*w-15)-1/5*(25-5*w) = 0
1/3*(3*w-15)-1/5*(25-5*w) = 0
2*w-10 = 0
2*w-10 = 0
2*w-10 = 0 // + 10
2*w = 10 // : 2
w = 10/2
w = 5
w = 5
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