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X in (-oo:+oo)
X/6 = 10/8 // - 10/8
X/6-(10/8) = 0
X/6-5/4 = 0
1/6*X-5/4 = 0 // + 5/4
1/6*X = 5/4 // : 1/6
X = 5/4/1/6
X = 15/2
X = 15/2
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