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20=4d+4
We move all terms to the left:
20-(4d+4)=0
We get rid of parentheses
-4d-4+20=0
We add all the numbers together, and all the variables
-4d+16=0
We move all terms containing d to the left, all other terms to the right
-4d=-16
d=-16/-4
d=+4
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