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7*x-(1/2) = 2/3 // - 2/3
7*x-(1/2)-(2/3) = 0
7*x-1/2-2/3 = 0
7*x-7/6 = 0 // + 7/6
7*x = 7/6 // : 7
x = 7/6/7
x = 1/6
x = 1/6
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