Steps to solve:
-6 + 2[6 + 4((-3)^2 - 7)]
~Solve exponent
-6 + 2[6 + 4(9 - 7)]
~Solve whats in parenthesis
-6 + 2[6 + 4(2)]
~Multiply
-6 + 2[6 + 8]
~Add
-6 + 2[14]
-6 + 28
22
Best of Luck!