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