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(1) a-(-b)=a+b ~ 21-(-18)=21+18
(2) a-(-b)=a+b ~ 118-(-125)=118+125
(3) a-(-b)=a+b ~ 75-(-84)=75+84
(4) a-(-b)=a+b ~ 28-(-11)=28+11
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it is from ncert course
and its formula will be this add in the answer
a-(-b)=a+b
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Answer:
21 +18=39
118+125=243
75+84=159
28+11=39
hope it will help you
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