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