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3*x-(1/7) = 2/3 // - 2/3
3*x-(1/7)-(2/3) = 0
3*x-1/7-2/3 = 0
3*x-17/21 = 0 // + 17/21
3*x = 17/21 // : 3
x = 17/21/3
x = 17/63
x = 17/63
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