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w in (-oo:+oo)
(1/10)*(6-w) = (1/5)*(4-(2*w)) // - (1/5)*(4-(2*w))
(1/10)*(6-w)-((1/5)*(4-(2*w))) = 0
(1/10)*(6-w)+(-1/5)*(4-2*w) = 0
1/10*(6-w)-1/5*(4-2*w) = 0
1/10*(6-w)-1/5*(4-2*w) = 0
3/10*w-1/5 = 0
3/10*w-1/5 = 0
3/10*w-1/5 = 0 // + 1/5
3/10*w = 1/5 // : 3/10
w = 1/5/3/10
w = 2/3
w = 2/3
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