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X in (-oo:+oo)
X/9 = 15/6 // - 15/6
X/9-(15/6) = 0
X/9-5/2 = 0
1/9*X-5/2 = 0 // + 5/2
1/9*X = 5/2 // : 1/9
X = 5/2/1/9
X = 45/2
X = 45/2
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