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w in (-oo:+oo)
6/5-(3/5) = (4/7)*w+(6/7)*w // - (4/7)*w+(6/7)*w
6/5-((4/7)*w)-((6/7)*w)-(3/5) = 0
(-4/7)*w+(-6/7)*w+6/5-3/5 = 0
3/5-10/7*w = 0 // - 3/5
-10/7*w = -3/5 // : -10/7
w = -3/5/(-10/7)
w = 21/50
w = 21/50
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