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x^2*((15*x^4-(6*x^3))/3) = 0
x^2*((15*x^4-6*x^3)/3) = 0
(x^2*(15*x^4-6*x^3))/3 = 0
15*x^4-6*x^3 = 0
3*x^3*(5*x-2) = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
3*x^3*(x-2/5) = 0
(3*x^2*x^3*(x-2/5))/3 = 0
( 3*x^3 )
3*x^3 = 0 // : 3
x^3 = 0
x = 0
( x-2/5 )
x-2/5 = 0 // + 2/5
x = 2/5
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0, 2/5, 0 }
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