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x in (-oo:+oo)
x^2*((5*(3*x^2+1))/1) = 0
5*x^2*(3*x^2+1) = 0
( 3*x^2+1 )
3*x^2 = -1 // : 3
x^2 = -1/3
( 5*x^2 )
5*x^2 = 0 // : 5
x^2 = 0
x = 0
x = 0
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