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w in (-oo:+oo)
176/35 = (4/5)*w-((6/7)*w)+5 // - (4/5)*w-((6/7)*w)+5
(6/7)*w-((4/5)*w)+176/35-5 = 0
(-4/5)*w+(6/7)*w+176/35-5 = 0
2/35*w+1/35 = 0 // - 1/35
2/35*w = -1/35 // : 2/35
w = -1/35/2/35
w = -1/2
w = -1/2
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