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X in (-oo:+oo)
X/7 = 2/3 // - 2/3
X/7-(2/3) = 0
X/7-2/3 = 0
1/7*X-2/3 = 0 // + 2/3
1/7*X = 2/3 // : 1/7
X = 2/3/1/7
X = 14/3
X = 14/3
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