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z in (-oo:+oo)
((z-3)/6)*(z+3) = 0
((z-3)*(z+3))/6 = 0
( z+3 )
z+3 = 0 // - 3
z = -3
( z-3 )
z-3 = 0 // + 3
z = 3
z in { -3, 3 }
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