verify a-(-b)=a+b for a=20,b=19
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Step-by-step explanation:
(i) a = 21, b = 18
a – (-b) = 21-(-18)
21-(-18) = 21 + 18
21+18= 39
a + b = 21+18
21+18 = 39
21-(-18) = 21+18 = 39
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