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x*((6*x-11)/2) = 0
(x*(6*x-11))/2 = 0
( 6*x-11 )
6*x-11 = 0 // + 11
6*x = 11 // : 6
x = 11/6
( x )
x = 0
x in { 11/6, 0 }
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