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12*x^6-(x^3*((16*x^4)/4)) = 0
12*x^6-4*x^7 = 0
12*x^6-4*x^7 = 0
4*x^6*(3-x) = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
4*x^6 = 0
4*x^6 = 0 // : 4
x^6 = 0
x = 0
x in { 3, 0 }
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