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-2(3+1)=4D+1-2D
We move all terms to the left:
-2(3+1)-(4D+1-2D)=0
We add all the numbers together, and all the variables
-(2D+1)-24=0
We get rid of parentheses
-2D-1-24=0
We add all the numbers together, and all the variables
-2D-25=0
We move all terms containing D to the left, all other terms to the right
-2D=25
D=25/-2
D=-12+1/2
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