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X in (-oo:+oo)
X/5 = 18/15 // - 18/15
X/5-(18/15) = 0
X/5-6/5 = 0
1/5*X-6/5 = 0 // + 6/5
1/5*X = 6/5 // : 1/5
X = 6/5/1/5
X = 6
X = 6
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