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X in (-oo:+oo)
X/25 = 16/100 // - 16/100
X/25-(16/100) = 0
X/25-4/25 = 0
1/25*X-4/25 = 0 // + 4/25
1/25*X = 4/25 // : 1/25
X = 4/25/1/25
X = 4
X = 4
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