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X in (-oo:+oo)
X/23 = 15/3 // - 15/3
X/23-(15/3) = 0
X/23-5 = 0
1/23*X-5 = 0 // + 5
1/23*X = 5 // : 1/23
X = 5/1/23
X = 115
X = 115
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