Posted by bailey on Tuesday, April 13, 2010 at 7:26pm.
Please check your problem again. It looks like you have an error.
OOps! My error.
12d - 9 = 15d + 9
12d - 15d = 9 + 9
-3d = 18
d = -6
how to solve -6r-5=7-12r
how to solve -6r-5=7-12r
r+2
r=2
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