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210=20+8d
We move all terms to the left:
210-(20+8d)=0
We add all the numbers together, and all the variables
-(8d+20)+210=0
We get rid of parentheses
-8d-20+210=0
We add all the numbers together, and all the variables
-8d+190=0
We move all terms containing d to the left, all other terms to the right
-8d=-190
d=-190/-8
d=23+3/4
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