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X in (-oo:+oo)
X/7-4 = 13/14 // - 13/14
X/7-(13/14)-4 = 0
X/7-13/14-4 = 0
1/7*X-69/14 = 0 // + 69/14
1/7*X = 69/14 // : 1/7
X = 69/14/1/7
X = 69/2
X = 69/2
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