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