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X in (-oo:+oo)
6/1-X = X+7/1 // - X+7/1
6/1-X-X-(7/1) = 0
6-X-X-7 = 0
-2*X-1 = 0 // + 1
-2*X = 1 // : -2
X = 1/(-2)
X = -1/2
X = -1/2
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