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20=10+8+d
We move all terms to the left:
20-(10+8+d)=0
We add all the numbers together, and all the variables
-(d+18)+20=0
We get rid of parentheses
-d-18+20=0
We add all the numbers together, and all the variables
-1d+2=0
We move all terms containing d to the left, all other terms to the right
-d=-2
d=-2/-1
d=+2
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