12x4+9x3-15x2/3x2

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Solution for 12x4+9x3-15x2/3x2 equation: 


x in (-oo:+oo)

12*x^4-(((15*x^2)/3)*x^2)+9*x^3 = 0

12*x^4-5*x^4+9*x^3 = 0

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

x^3*(7*x+9) = 0

7*x+9 = 0 // - 9

7*x = -9 // : 7

x = -9/7

x^3 = 0

1*x^3 = 0 // : 1

x^3 = 0

x = 0

x in { -9/7, 0 }

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