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(1/3)*(12*x+9) = 11-(5*(x-3)) // - 11-(5*(x-3))
(1/3)*(12*x+9)+5*(x-3)-11 = 0
1/3*(12*x+9)+5*(x-3)-11 = 0
1/3*(12*x+9)+5*(x-3)-11 = 0
9*x-12-11 = 0
9*x-23 = 0
9*x-23 = 0
9*x-23 = 0 // + 23
9*x = 23 // : 9
x = 23/9
x = 23/9
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