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(2*x-1)/9 = -3 // + 3
(2*x-1)/9+3 = 0
(2*x-1)/9+(3*9)/9 = 0
2*x+3*9-1 = 0
2*x+26 = 0
(2*x+26)/9 = 0
(2*x+26)/9 = 0 // * 9
2*x+26 = 0
2*x+26 = 0 // - 26
2*x = -26 // : 2
x = -26/2
x = -13
x = -13
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