28x^4+9x^3+12x^2/4x^2

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Solution for 28x^4+9x^3+12x^2/4x^2 equation: 


x in (-oo:+oo)

28*x^4+((12*x^2)/4)*x^2+9*x^3 = 0

31*x^4+9*x^3 = 0

x^3*(31*x+9) = 0

31*x+9 = 0 // - 9

31*x = -9 // : 31

x = -9/31

x^3 = 0

1*x^3 = 0 // : 1

x^3 = 0

x = 0

x in { -9/31, 0 }

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