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X in (-oo:+oo)
X/11 = -2/13 // + -2/13
X/11-(-2/13) = 0
X/11+2/13 = 0
1/11*X+2/13 = 0 // - 2/13
1/11*X = -2/13 // : 1/11
X = -2/13/1/11
X = -22/13
X = -22/13
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