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x^2*((36*x^5-(28*x^4))/4) = 0
x^2*((36*x^5-28*x^4)/4) = 0
(x^2*(36*x^5-28*x^4))/4 = 0
36*x^5-28*x^4 = 0
4*x^4*(9*x-7) = 0
9*x-7 = 0 // + 7
9*x = 7 // : 9
x = 7/9
4*x^4*(x-7/9) = 0
(4*x^2*x^4*(x-7/9))/4 = 0
( 4*x^4 )
4*x^4 = 0 // : 4
x^4 = 0
x = 0
( x-7/9 )
x-7/9 = 0 // + 7/9
x = 7/9
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0, 7/9, 0 }
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