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X in (-oo:+oo)
X/56 = 18/63 // - 18/63
X/56-(18/63) = 0
X/56-2/7 = 0
1/56*X-2/7 = 0 // + 2/7
1/56*X = 2/7 // : 1/56
X = 2/7/1/56
X = 16
X = 16
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