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X in (-oo:+oo)
(X/(-1))/6 = 6/7 // - 6/7
(X/(-1))/6-(6/7) = 0
-X/6-6/7 = 0
-1/6*X-6/7 = 0 // + 6/7
-1/6*X = 6/7 // : -1/6
X = 6/7/(-1/6)
X = -36/7
X = -36/7
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