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z in (-oo:+oo)
(1/3)*(18*z^2+12*z) = 0
1/3*(18*z^2+12*z) = 0
18*z^2+12*z = 0
6*z*(3*z+2) = 0
3*z+2 = 0 // - 2
3*z = -2 // : 3
z = -2/3
6*z*(z+2/3) = 0
1/3*6*z*(z+2/3) = 0
( 6*z )
6*z = 0 // : 6
z = 0
( z+2/3 )
z+2/3 = 0 // - 2/3
z = -2/3
z in { 0, -2/3 }
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