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z in (-oo:+oo)
(3*z^2*((z+9)/12))/(2+9) = 0
(3*z^2*(z+9))/(11*12) = 0
( 3*z^2 )
3*z^2 = 0 // : 3
z^2 = 0
z = 0
( z+9 )
z+9 = 0 // - 9
z = -9
z in { 0, -9 }
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