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X in (-oo:+oo)
X/7 = 27/9 // - 27/9
X/7-(27/9) = 0
X/7-3 = 0
1/7*X-3 = 0 // + 3
1/7*X = 3 // : 1/7
X = 3/1/7
X = 21
X = 21
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