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7*x-(2/6) = -6 // + 6
7*x-(2/6)+6 = 0
7*x-1/3+6 = 0
7*x+17/3 = 0 // - 17/3
7*x = -17/3 // : 7
x = -17/3/7
x = -17/21
x = -17/21
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