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2(d+1)=5d=7
We move all terms to the left:
2(d+1)-(5d)=0
We add all the numbers together, and all the variables
-5d+2(d+1)=0
We multiply parentheses
-5d+2d+2=0
We add all the numbers together, and all the variables
-3d+2=0
We move all terms containing d to the left, all other terms to the right
-3d=-2
d=-2/-3
d=2/3
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