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8-15=19-9D
We move all terms to the left:
8-15-(19-9D)=0
We add all the numbers together, and all the variables
-(-9D+19)+8-15=0
We add all the numbers together, and all the variables
-(-9D+19)-7=0
We get rid of parentheses
9D-19-7=0
We add all the numbers together, and all the variables
9D-26=0
We move all terms containing D to the left, all other terms to the right
9D=26
D=26/9
D=2+8/9
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