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X in (-oo:+oo)
X/100 = 15/100 // - 15/100
X/100-(15/100) = 0
X/100-3/20 = 0
1/100*X-3/20 = 0 // + 3/20
1/100*X = 3/20 // : 1/100
X = 3/20/1/100
X = 15
X = 15
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