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(1/9)*(7*x-9) = (x+9)/18 // - (x+9)/18
(1/9)*(7*x-9)-((x+9)/18) = 0
1/9*(7*x-9)+(-1*(x+9))/18 = 0
(1/9*18*(7*x-9))/18+(-1*(x+9))/18 = 0
1/9*18*(7*x-9)-1*(x+9) = 0
13*x-27 = 0
(13*x-27)/18 = 0
(13*x-27)/18 = 0 // * 18
13*x-27 = 0
13*x-27 = 0 // + 27
13*x = 27 // : 13
x = 27/13
x = 27/13
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