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=7-0.5D
We move all terms to the left:
-(7-0.5D)=0
We add all the numbers together, and all the variables
-(-0.5D+7)=0
We get rid of parentheses
0.5D-7=0
We move all terms containing D to the left, all other terms to the right
0.5D=7
D=7/0.5
D=14
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