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2=-4-2D
We move all terms to the left:
2-(-4-2D)=0
We add all the numbers together, and all the variables
-(-2D-4)+2=0
We get rid of parentheses
2D+4+2=0
We add all the numbers together, and all the variables
2D+6=0
We move all terms containing D to the left, all other terms to the right
2D=-6
D=-6/2
D=-3
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