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w in (-oo:+oo)
-((2/7)*w)-1 = -71/63 // + -71/63
-((2/7)*w)-(-71/63)-1 = 0
(-2/7)*w+71/63-1 = 0
8/63-2/7*w = 0 // - 8/63
-2/7*w = -8/63 // : -2/7
w = -8/63/(-2/7)
w = 4/9
w = 4/9
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