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X in (-oo:+oo)
X/11 = X/12-13 // - X/12-13
X/11-(X/12)+13 = 0
1/132*X+13 = 0 // - 13
1/132*X = -13 // : 1/132
X = -13/1/132
X = -1716
X = -1716
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