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X in (-oo:+oo)
X/9-8 = 7/18 // - 7/18
X/9-(7/18)-8 = 0
X/9-7/18-8 = 0
1/9*X-151/18 = 0 // + 151/18
1/9*X = 151/18 // : 1/9
X = 151/18/1/9
X = 151/2
X = 151/2
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