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X in (-oo:+oo)
X/25 = 18/5 // - 18/5
X/25-(18/5) = 0
X/25-18/5 = 0
1/25*X-18/5 = 0 // + 18/5
1/25*X = 18/5 // : 1/25
X = 18/5/1/25
X = 90
X = 90
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