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Answers by Carolyn C.

a/a+1 -1/a-1 (answer)

Just like any other adding and subtracting with unlike denominators, you need to find the least common denominator. In this case, the LCD is just the multiple of the denominators. So multiply both the top and bottom of a/a+1 by (a-1) and multiply both the top and bottom of 1/a-1 by (a+1)...