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X in (-oo:+oo)
X/100 = 135/150 // - 135/150
X/100-(135/150) = 0
X/100-9/10 = 0
1/100*X-9/10 = 0 // + 9/10
1/100*X = 9/10 // : 1/100
X = 9/10/1/100
X = 90
X = 90
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