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X in (-oo:+oo)
X/100 = 7.5 // - 7.5
X/100-7.5 = 0
1/100*X-7.5 = 0 // + 7.5
1/100*X = 7.5 // : 1/100
X = 7.5/1/100
X = 750
X = 750
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