Compute each of the following mentally:
a. 180 + 97 – 23 + 20 – 140 + 26b. 87 – 42 + 70 – 38 + 43
a. 180 + 97 – 23 + 20 – 140 + 26
b. 87 – 42 + 70 – 38 + 43
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