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X in (-oo:+oo)
X/8 = 9/7 // - 9/7
X/8-(9/7) = 0
X/8-9/7 = 0
1/8*X-9/7 = 0 // + 9/7
1/8*X = 9/7 // : 1/8
X = 9/7/1/8
X = 72/7
X = 72/7
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