( 6-6 ) +7

This is the last one I will be answering. Spamming these questions are not an option.

PEMDAS.
Parenthesis: You always do this first.
Exponent: Do this second
Multiply/Divide: Do these third. It is determined with the first on the left.
Add/Subtract. Do these last. Ones are determined with the first on the left. (Not the right.)

Now on to the question: (6-6) + 7
Do the ones in the parenthesis.
6-6 = 0.
Add seven.
0 + 7 = 7.