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X in (-oo:+oo)
X/100 = 250/650 // - 250/650
X/100-(250/650) = 0
X/100-5/13 = 0
1/100*X-5/13 = 0 // + 5/13
1/100*X = 5/13 // : 1/100
X = 5/13/1/100
X = 500/13
X = 500/13
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