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-20*x^6-(24*x^4)-(((12*x^2)/(-4))*x^2) = 0
3*x^4-20*x^6-24*x^4 = 0
-20*x^6-21*x^4 = 0
-x^4*(20*x^2+21) = 0
20*x^2 = -21 // : 20
x^2 = -21/20
-x^4 = 0
-1*x^4 = 0 // : -1
x^4 = 0
x = 0
x = 0
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