Z-transform involving the unit step function and an exponential

LaTeX Code:

a^n u(n) \Leftrightarrow \frac{z}{{\left( {z - a} \right)}},\left| z \right|> \left| a \right|

MathType 5.0 Code:

% MathType!MTEF!2!1!+-
% feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
% 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb
% a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr
% 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaiaadggadaahaa
% Wcbeqaaiaad6gaaaGccaWG1bGaaiikaiaad6gacaGGPaGaeyi1HS9a
% aSaaaeaacaWG6baabaWaaeWaaeaacaWG6bGaeyOeI0IaamyyaaGaay
% jkaiaawMcaaaaacaGGSaWaaqWaaeaacaWG6baacaGLhWUaayjcSdGa
% eyOpa4ZaaqWaaeaacaWGHbaacaGLhWUaayjcSdaaaa!4CDD!

Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.