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w in (-oo:+oo)
2*(-6*w-8) = -40 // + 40
2*(-6*w-8)+40 = 0
2*(-6*w-8)+40 = 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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