Posted by kev on Monday, July 28, 2008 at 2:49am.
+3
The sum of the two terms in parentheses is a - 3b
If you want the difference, it should be written
(5a - 2b) - (-4a + 5b)
which is the same as
(5a - 2b) + (4a - 5b) = 9a - 7b
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