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(3*x+7/9)*(3*x-(1/3)) = 0
(3*x+7/9)*(3*x-1/3) = 0
( 3*x+7/9 )
3*x+7/9 = 0 // - 7/9
3*x = -7/9 // : 3
x = -7/9/3
x = -7/27
( 3*x-1/3 )
3*x-1/3 = 0 // + 1/3
3*x = 1/3 // : 3
x = 1/3/3
x = 1/9
x in { -7/27, 1/9 }
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