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12-3=2D-3
We move all terms to the left:
12-3-(2D-3)=0
We add all the numbers together, and all the variables
-(2D-3)+9=0
We get rid of parentheses
-2D+3+9=0
We add all the numbers together, and all the variables
-2D+12=0
We move all terms containing D to the left, all other terms to the right
-2D=-12
D=-12/-2
D=+6
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