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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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