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x*((12*x^2-(16*x))/4) = 0
x*((12*x^2-16*x)/4) = 0
(x*(12*x^2-16*x))/4 = 0
12*x^2-16*x = 0
4*x*(3*x-4) = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
4*x*(x-4/3) = 0
(4*x*x*(x-4/3))/4 = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x-4/3 )
x-4/3 = 0 // + 4/3
x = 4/3
( x )
x = 0
x in { 0, 4/3, 0 }
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