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20=10+2d
We move all terms to the left:
20-(10+2d)=0
We add all the numbers together, and all the variables
-(2d+10)+20=0
We get rid of parentheses
-2d-10+20=0
We add all the numbers together, and all the variables
-2d+10=0
We move all terms containing d to the left, all other terms to the right
-2d=-10
d=-10/-2
d=+5
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