Posted by Lourane on Saturday, June 9, 2012 at 8:07pm.
This is your original problem. You need to combine like terms.
12x + 4 - 11y - 6x - 9 -y
12x - 6x = 6x
-11y - y = -12y
4 - 9 = -5
So --
6x - 12y - 5
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