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=-227+0.3D
We move all terms to the left:
-(-227+0.3D)=0
We add all the numbers together, and all the variables
-(0.3D-227)=0
We get rid of parentheses
-0.3D+227=0
We move all terms containing D to the left, all other terms to the right
-0.3D=-227
D=-227/-0.3
D=756+0.20000000000002/0.3
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