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X in (-oo:+oo)
X/9 = 100/90 // - 100/90
X/9-(100/90) = 0
X/9-10/9 = 0
1/9*X-10/9 = 0 // + 10/9
1/9*X = 10/9 // : 1/9
X = 10/9/1/9
X = 10
X = 10
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