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w in (-oo:+oo)
-116/5 = 6*w-4*w+4/5 // - 6*w-4*w+4/5
-(-4*w)-(6*w)-116/5-(4/5) = 0
4*w-6*w-116/5-4/5 = 0
-2*w-24 = 0 // + 24
-2*w = 24 // : -2
w = 24/(-2)
w = -12
w = -12
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