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w in (-oo:+oo)
4-(6*w) = 3*(w/2+0.5) // - 3*(w/2+0.5)
4-(3*(w/2+0.5))-(6*w) = 0
4-3*(w/2+0.5)-6*w = 0
4-3*(1/2*w+0.5)-6*w = 0
4-3*(1/2*w+0.5)-6*w = 0
4-15/2*w-1.5 = 0
2.5-15/2*w = 0
2.5-15/2*w = 0
2.5-15/2*w = 0 // - 2.5
-15/2*w = -2.5 // : -15/2
w = -2.5/(-15/2)
w = 0.33333333
w = 0.33333333
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