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D( z )
4*z = 0
z+1 = 0
3*z = 0
z = 0
4*z = 0
4*z = 0
4*z = 0 // : 4
z = 0
z+1 = 0
z+1 = 0
z+1 = 0 // - 1
z = -1
3*z = 0
3*z = 0
3*z = 0 // : 3
z = 0
z = 0
z = 0
z in (-oo:-1) U (-1:0) U (0:+oo)
1/z-(1/(4*z))-(1/(3*z)) = 12/(z+1) // - 12/(z+1)
1/z-(12/(z+1))-(1/(4*z))-(1/(3*z)) = 0
1/z-12*(z+1)^-1+(-1/4)*z^-1+(-1/3)*z^-1 = 0
1/z-12/(z+1)-1/(4*z)-1/(3*z) = 0
(-12*3*4*z*z*z)/(3*4*z*z*z*(z+1))+(1*3*4*z*z*(z+1))/(3*4*z*z*z*(z+1))+(-1*3*z*z*(z+1))/(3*4*z*z*z*(z+1))+(-1*4*z*z*(z+1))/(3*4*z*z*z*(z+1)) = 0
1*3*4*z*z*(z+1)-1*3*z*z*(z+1)-1*4*z*z*(z+1)-12*3*4*z*z*z = 0
12*z^2-132*z^3-3*z^3-4*z^3-3*z^2-4*z^2 = 0
9*z^2-135*z^3-4*z^3-4*z^2 = 0
5*z^2-139*z^3 = 0
5*z^2-139*z^3 = 0
z^2*(5-139*z) = 0
5-139*z = 0 // - 5
-139*z = -5 // : -139
z = -5/(-139)
z = 5/139
z^2*(z-5/139) = 0
(z^2*(z-5/139))/(3*4*z*z*z*(z+1)) = 0
(z^2*(z-5/139))/(3*4*z*z*z*(z+1)) = 0 // * 3*4*z*z*z*(z+1)
z^2*(z-5/139) = 0
( z-5/139 )
z-5/139 = 0 // + 5/139
z = 5/139
( z^2 )
1*z^2 = 0 // : 1
z^2 = 0
z = 0
z in { 0}
z = 5/139
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