5 - 7 (-6x + 9z) use x = 7 and z = 6

Answer: I believe it is - 79

I believe the answer is - 24.

You start in the parentheses, multiplying - 6 by 7, which comes to - 42. You also multiply 9 by 6, coming to 54.

This makes the expression 5-7 (-42+54)

Continuing in the parentheses, we add - 42 and 54, which is the same as subtracting 42 from 54, which comes to 12.

5-7 is - 2.

The last thing we need to do is multiply - 2 by 12, which comes to - 24.