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12*x^5+((4*x^2)/4)*x^2-(6*x^3) = 0
12*x^5+((4*x^2)/4)*x^2-6*x^3 = 0
12*x^5+x^4-6*x^3 = 0
x^3*(12*x^2+x-6) = 0
12*x^2+x-6 = 0
DELTA = 1^2-(-6*4*12)
DELTA = 289
DELTA > 0
x = (289^(1/2)-1)/(2*12) or x = (-289^(1/2)-1)/(2*12)
x = 2/3 or x = -3/4
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { -3/4, 2/3, 0 }
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