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=-45D+8-12
We move all terms to the left:
-(-45D+8-12)=0
We add all the numbers together, and all the variables
-(-45D-4)=0
We get rid of parentheses
45D+4=0
We move all terms containing D to the left, all other terms to the right
45D=-4
D=-4/45
D=-4/45
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