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