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((9*x^3)/(-6))*x^4-12*x^5 = 0
-3/2*x^7-12*x^5 = 0
-3*x^5*(1/2*x^2+4) = 0
1/2*x^2 = -4 // : 1/2
x^2 = -8
-3*x^5 = 0
-3*x^5 = 0 // : -3
x^5 = 0
x = 0
x = 0
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