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X in (-oo:+oo)
6/13 = X/78 // - X/78
6/13-(X/78) = 0
6/13-1/78*X = 0 // - 6/13
-1/78*X = -6/13 // : -1/78
X = -6/13/(-1/78)
X = 36
X = 36
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