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8. (a) If a = -28, b = 14 and c = -17, verify:
(1) a+b=bta (ii) b-C+C - b
(b) Verify a -(-6) = a + hf
(iii) b-(-c) = b + c
(iv) (a + b) + c = a + (b + c)
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Explanation:
) (a + b) + c = a + (b + c)
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