Solve in inverse operations -a-13=-10

Question

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

Answer 1

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

 

 

Answer 2

-a-13=-10

 

Add a+10 to both sides:

 

-3 = a