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(1/3)*x*(6*x-3) = 0
1/3*x*(6*x-3) = 0
( 1/3*x )
1/3*x = 0 // : 1/3
x = 0
( 6*x-3 )
6*x-3 = 0 // + 3
6*x = 3 // : 6
x = 3/6
x = 1/2
x in { 0, 1/2 }
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