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X in (-oo:+oo)
X/100 = 18/60 // - 18/60
X/100-(18/60) = 0
X/100-3/10 = 0
1/100*X-3/10 = 0 // + 3/10
1/100*X = 3/10 // : 1/100
X = 3/10/1/100
X = 30
X = 30
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