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