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x in (-oo:+oo)
2*x-(1/3) = 6/7 // - 6/7
2*x-(1/3)-(6/7) = 0
2*x-1/3-6/7 = 0
2*x-25/21 = 0 // + 25/21
2*x = 25/21 // : 2
x = 25/21/2
x = 25/42
x = 25/42
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