99
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Adding a negative number has the same effect as subtracting a positive number. In this instance, 77 + (-22) = 77 - 22 = 55.
99
The first integer must equal 77 - 69 = 8 , since doubling it increases the sum by this amount. Similarly, the second integer must = 91 - 69 = 22. Then the third integer is 69 - 22 - 8 = 39.
-15.4
12 + 77 = 89
22