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X in (-oo:+oo)
X/6 = 2/21 // - 2/21
X/6-(2/21) = 0
X/6-2/21 = 0
1/6*X-2/21 = 0 // + 2/21
1/6*X = 2/21 // : 1/6
X = 2/21/1/6
X = 4/7
X = 4/7
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