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w in (-oo:+oo)
(6/7)*w+5/9 = -235/63 // + -235/63
(6/7)*w+5/9-(-235/63) = 0
(6/7)*w+5/9+235/63 = 0
6/7*w+30/7 = 0 // - 30/7
6/7*w = -30/7 // : 6/7
w = -30/7/6/7
w = -5
w = -5
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