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x*((7*x-1)/2) = 0
(x*(7*x-1))/2 = 0
( 7*x-1 )
7*x-1 = 0 // + 1
7*x = 1 // : 7
x = 1/7
( x )
x = 0
x in { 1/7, 0 }
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