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-20+15d=2d+10+8d
We move all terms to the left:
-20+15d-(2d+10+8d)=0
We add all the numbers together, and all the variables
15d-(10d+10)-20=0
We get rid of parentheses
15d-10d-10-20=0
We add all the numbers together, and all the variables
5d-30=0
We move all terms containing d to the left, all other terms to the right
5d=30
d=30/5
d=6
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