Posted by Lourane on Saturday, June 9, 2012 at 9:04pm.
Original problem:
11/14a - 1/15b + 1/14a - 11/15b
You're half right.
12/14a = 6/7a
But - 12/15b = -4/5b
11/14a - 1/15b + 1/14a - 11/15b = 6/7a - 4/5b
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