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