Как будет по английски: Это очень сложно,я не в силах этого решить?

This is very hard, I can\'t solve it.It\'s too difficult, I fail to handle it.It is so tough, I am unable to settle it.This is very tricky, I\'m not able to work it out.It is so complicated, I\'m helpless at fixing this.This is very problematic, I can not make a decision.