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w in (-oo:+oo)
(1/3)*(3*w-15) = (-1/5)*(25-(5*w)) // - (-1/5)*(25-(5*w))
(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
0 = 0
0 = 0
w belongs to the empty set
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