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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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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
4.8 4.8 (4 lesson ratings) (4)
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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
 
 
Steve S. | Tutoring in Precalculus, Trig, and Differential CalculusTutoring in Precalculus, Trig, and Diffe...
5.0 5.0 (3 lesson ratings) (3)
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-a-13=-10
 
Add a+10 to both sides:
 
-3 = a