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Answer:
+17 on the first 2 lines
91 on the second one
Explanation:
you have to "get rid of" the 17 on the right. So, you subtract it. You have to keep both sides the same so you have to add 17 to the left too!
17, 0,
91
74=x-17
74 + 17 = x - 17 + 0
91 = x