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