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(1/9)*(9*x-4) = (x-4)/18 // - (x-4)/18
(1/9)*(9*x-4)-((x-4)/18) = 0
1/9*(9*x-4)+(-1*(x-4))/18 = 0
(1/9*18*(9*x-4))/18+(-1*(x-4))/18 = 0
1/9*18*(9*x-4)-1*(x-4) = 0
17*x-4 = 0
(17*x-4)/18 = 0
(17*x-4)/18 = 0 // * 18
17*x-4 = 0
17*x-4 = 0 // + 4
17*x = 4 // : 17
x = 4/17
x = 4/17
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