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w in (-oo:+oo)
(1/3)*(6-(15*w)) = (3/8)*(40*w-8) // - (3/8)*(40*w-8)
(1/3)*(6-(15*w))-((3/8)*(40*w-8)) = 0
(1/3)*(6-15*w)+(-3/8)*(40*w-8) = 0
1/3*(6-15*w)-3/8*(40*w-8) = 0
1/3*(6-15*w)-3/8*(40*w-8) = 0
5-20*w = 0
5-20*w = 0
5-20*w = 0 // - 5
-20*w = -5 // : -20
w = -5/(-20)
w = 1/4
w = 1/4
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