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X in (-oo:+oo)
X/9 = 40/25 // - 40/25
X/9-(40/25) = 0
X/9-8/5 = 0
1/9*X-8/5 = 0 // + 8/5
1/9*X = 8/5 // : 1/9
X = 8/5/1/9
X = 72/5
X = 72/5
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