(16-x^2)/5x^4

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Solution for (16-x^2)/5x^4 equation: 


x in (-oo:+oo)

x^4*((16-x^2)/5) = 0

(x^4*(16-x^2))/5 = 0

( 16-x^2 )

-1*x^2 = -16 // : -1

x^2 = 16

x^2 = 16 // ^ 1/2

abs(x) = 4

x = 4 or x = -4

( x^4 )

1*x^4 = 0 // : 1

x^4 = 0

x = 0

x in { 4, -4, 0 }

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