30+6−5+7−17= 30+6-5+7-17= 30+6−5+7−17=
Insofar as the exercise only involves addition and subtraction operations, we will solve it from left to right:
30+6=36 30+6=36 30+6=36
36−5=31 36-5=31 36−5=31
31+7=38 31+7=38 31+7=38
38−17=21 38-17=21 38−17=21
21 21 21