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w in (-oo:+oo)
(-5/7)*w+1 = 83/63 // - 83/63
(-5/7)*w-(83/63)+1 = 0
(-5/7)*w-83/63+1 = 0
-5/7*w-20/63 = 0 // + 20/63
-5/7*w = 20/63 // : -5/7
w = 20/63/(-5/7)
w = -4/9
w = -4/9
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