Question

solve this problem please​

Answer 1

Answer:

when a=21 and b=. 18

a-(-b) =a+b

21-(-18)= 21+18

21+18=21+18

39=39

when a=28 and b=11

a-(-b)=a+b

28-(-11)= 28+11

28+11=28+11

39=39

Answer 2

Step-by-step explanation:

I think in this way the answer will come

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