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x in (-oo:+oo)
x^3*((36*x^6-(28*x^3))/4) = 0
x^3*((36*x^6-28*x^3)/4) = 0
(x^3*(36*x^6-28*x^3))/4 = 0
36*x^6-28*x^3 = 0
4*x^3*(9*x^3-7) = 0
9*x^3 = 7 // : 9
x^3 = 7/9
x^3 = 7/9 // ^ 1/3
x = (7/9)^(1/3)
4*x^3*(x-(7/9)^(1/3)) = 0
(4*x^3*x^3*(x-(7/9)^(1/3)))/4 = 0
( 4*x^3 )
4*x^3 = 0 // : 4
x^3 = 0
x = 0
( x-(7/9)^(1/3) )
x-(7/9)^(1/3) = 0 // + (7/9)^(1/3)
x = (7/9)^(1/3)
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0, (7/9)^(1/3), 0 }
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