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X in (-oo:+oo)
X/7-(2/3) = 4/21 // - 4/21
X/7-(2/3)-(4/21) = 0
X/7-2/3-4/21 = 0
1/7*X-6/7 = 0 // + 6/7
1/7*X = 6/7 // : 1/7
X = 6/7/1/7
X = 6
X = 6
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