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Solve in inverse operations -a-13=-10

Please solve this problem quickly in inverse operations two step only.
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2 Answers

Inverse operation probably means take a quantity from one side of equation , and transferred it to the other side and change the sign ( move over).
    -a - 13 = -10
     -13 + 10= a
         -3 = a
Add a+10 to both sides:
-3 = a