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3=-4+4D
We move all terms to the left:
3-(-4+4D)=0
We add all the numbers together, and all the variables
-(4D-4)+3=0
We get rid of parentheses
-4D+4+3=0
We add all the numbers together, and all the variables
-4D+7=0
We move all terms containing D to the left, all other terms to the right
-4D=-7
D=-7/-4
D=1+3/4
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