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12*x^3-(6*x^2)+((2*x)/2)*x = 0
12*x^3-6*x^2+((2*x)/2)*x = 0
12*x^3-5*x^2 = 0
x^2*(12*x-5) = 0
12*x-5 = 0 // + 5
12*x = 5 // : 12
x = 5/12
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 5/12, 0 }
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