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804=27+37d
We move all terms to the left:
804-(27+37d)=0
We add all the numbers together, and all the variables
-(37d+27)+804=0
We get rid of parentheses
-37d-27+804=0
We add all the numbers together, and all the variables
-37d+777=0
We move all terms containing d to the left, all other terms to the right
-37d=-777
d=-777/-37
d=+21
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