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+12-3=5D+6
We move all terms to the left:
+12-3-(5D+6)=0
We add all the numbers together, and all the variables
-(5D+6)+9=0
We get rid of parentheses
-5D-6+9=0
We add all the numbers together, and all the variables
-5D+3=0
We move all terms containing D to the left, all other terms to the right
-5D=-3
D=-3/-5
D=3/5
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