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12d -9 = 15d +9

subtract 12d from each side and add 9 to each side

0= 3d

divide by 3 on each side

0 = d.

because if zero is in the numerator or dominator it makes the faction 0.

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Q: What is 12d - 9 equals 15d plus 9?
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12d-9 equals 15d plus 9?

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