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w in (-oo:+oo)
4*w-(6*w)+4/7 = 48/35 // - 48/35
4*w-(6*w)+4/7-(48/35) = 0
4*w-6*w+4/7-48/35 = 0
-2*w-4/5 = 0 // + 4/5
-2*w = 4/5 // : -2
w = 4/5/(-2)
w = -2/5
w = -2/5
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