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w in (-oo:+oo)
4*(1-3*w) = -20 // + 20
4*(1-3*w)+20 = 0
4*(1-3*w)+20 = 0
24-12*w = 0
24-12*w = 0
24-12*w = 0 // - 24
-12*w = -24 // : -12
w = -24/(-12)
w = 2
w = 2
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