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X in (-oo:+oo)
X/18 = 48/108 // - 48/108
X/18-(48/108) = 0
X/18-4/9 = 0
1/18*X-4/9 = 0 // + 4/9
1/18*X = 4/9 // : 1/18
X = 4/9/1/18
X = 8
X = 8
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