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(3*x-1)/9+x-4 = (3*x+1)/3 // - (3*x+1)/3
(3*x-1)/9-((3*x+1)/3)+x-4 = 0
(3*x-1)/9+(-1*(3*x+1))/3+x-4 = 0
(3*(3*x-1))/(3*9)+(-1*9*(3*x+1))/(3*9)+(3*9*x)/(3*9)+(-4*3*9)/(3*9) = 0
3*(3*x-1)-1*9*(3*x+1)+3*9*x-4*3*9 = 0
27*x-18*x-108-12 = 0
9*x-108-12 = 0
9*x-120 = 0
(9*x-120)/(3*9) = 0
(9*x-120)/(3*9) = 0 // * 3*9
9*x-120 = 0
9*x-120 = 0 // + 120
9*x = 120 // : 9
x = 120/9
x = 40/3
x = 40/3
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