Parenthesis operations are performed first.
If there is an exponential or radical number in the question, the second step is to solve these operations.
Then multiplication and division should be done.
Fourth, addition and subtraction must be done.
Also operations with the same priority are ordered from left to right.
First, let's put the given values in their places.
for x it is -23
for y it is -5
for z it is -10
( - 23 - 12) ÷ (-5) + (-10) // do the paranthesis first from left to right
-35 ÷ -5 -10 // then do the division
7 - 10 = -3 answer