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x in (-oo:+oo)
((4*x^2)/10)*(x+3) = 0
2/5*x^2*(x+3) = 0
( 2/5*x^2 )
2/5*x^2 = 0 // : 2/5
x^2 = 0
x = 0
( x+3 )
x+3 = 0 // - 3
x = -3
x in { 0, -3 }
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