college math
posted by Lourane .
ny answer is 6x  12y  5
12x 4  11y 6x  9 4

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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