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X in (-oo:+oo)
X/130 = 7/91 // - 7/91
X/130-(7/91) = 0
X/130-1/13 = 0
1/130*X-1/13 = 0 // + 1/13
1/130*X = 1/13 // : 1/130
X = 1/13/1/130
X = 10
X = 10
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