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(9*(x-4))/3 = 3*x+12/9 // - 3*x+12/9
(9*(x-4))/3-(3*x)-(12/9) = 0
(9*(x-4))/3-3*x-4/3 = 0
(9*(x-4))/3+(-3*3*x)/3-4/3 = 0
9*(x-4)-3*3*x-4 = 0
-36-4 = 0
-40 = 0
-40/3 = 0
-40/3 = 0 // * 3
-40 = 0
x belongs to the empty set
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