3) Verify that a + b = b + a by taking
(1) a = -7/5, b = 217
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Answer:
a = 21, b = 18
Rough
+ & becomes -
+ & + becomes +
- &- becomes +
a - (-b)
= 21 - (-18)
= 21 + 18
= 39
a+b
= 21 + 18
= 39
a-(-b) = a + b
Step-by-step explanation:
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