Life is like Math - SMS Joke

Life is like: 
MATHS: 
Friend kO 
Plus karO 
+ 
Dushman kO 
Minus karO 
- 
Khushia kO 
Multiply karO 
* 
Gam kO 
Divide karO 
:- 
aur 
. 
Life kO 
enjoy karO!