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2d+1=10+3d
We move all terms to the left:
2d+1-(10+3d)=0
We add all the numbers together, and all the variables
2d-(3d+10)+1=0
We get rid of parentheses
2d-3d-10+1=0
We add all the numbers together, and all the variables
-1d-9=0
We move all terms containing d to the left, all other terms to the right
-d=9
d=9/-1
d=-9
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