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posted by bailey on Tuesday, April 13, 2010 at 7:26pm.

12d - 9 = 15d + 9

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

r+2

r=2

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