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