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x in (-oo:+oo)
45*x^6+x^2*((12*x^4)/(-3))+9*x^5 = 0
41*x^6+9*x^5 = 0
x^5*(41*x+9) = 0
41*x+9 = 0 // - 9
41*x = -9 // : 41
x = -9/41
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { -9/41, 0 }
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