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