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-15d=20-20d
We move all terms to the left:
-15d-(20-20d)=0
We add all the numbers together, and all the variables
-15d-(-20d+20)=0
We get rid of parentheses
-15d+20d-20=0
We add all the numbers together, and all the variables
5d-20=0
We move all terms containing d to the left, all other terms to the right
5d=20
d=20/5
d=4
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