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12*x^3-(((3*x)/3)*x) = 0
12*x^3-x^2 = 0
12*x^3-x^2 = 0
x^2*(12*x-1) = 0
12*x-1 = 0 // + 1
12*x = 1 // : 12
x = 1/12
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 1/12, 0 }
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