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