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12*x^3-(16*x^2)-(((36*x)/4)*x) = 0
12*x^3-16*x^2-9*x^2 = 0
12*x^3-25*x^2 = 0
x^2*(12*x-25) = 0
12*x-25 = 0 // + 25
12*x = 25 // : 12
x = 25/12
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 25/12, 0 }
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