7 - 4 + 3 x 0 + 1 = 4

Just remember that multiply and divide are done before plus or minus

7 - 4 + 3 x 0 + 1

= 7 - 4 + (3 x 0) + 1

=7 - 4 + 0 + 1

= 4

How did you get 2 ??

I knew that. I'd rather not say how I got that. I now realise my embarassing mistake.
Thanks!

Not to worry, I make embarassing mistakes all the time.