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x^2*((14*x^4+6*x^3)/2) = 0
(x^2*(14*x^4+6*x^3))/2 = 0
14*x^4+6*x^3 = 0
2*x^3*(7*x+3) = 0
7*x+3 = 0 // - 3
7*x = -3 // : 7
x = -3/7
2*x^3*(x+3/7) = 0
(2*x^2*x^3*(x+3/7))/2 = 0
( 2*x^3 )
2*x^3 = 0 // : 2
x^3 = 0
x = 0
( x+3/7 )
x+3/7 = 0 // - 3/7
x = -3/7
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0, -3/7, 0 }
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