3 addends mean 3 numbers. Regroup I believe means carry over. So I'm thinking something like 36+29+12=
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6+4
10+6
11500
6+6 7+7 10+8 6+4
Solve the problem using the + sign for the variable. Then solve the problem using the - sign for the variable. Report your answer as the answer that you got using + or the answer that you got using -.