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