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2(d+1)-3=3
We move all terms to the left:
2(d+1)-3-(3)=0
We add all the numbers together, and all the variables
2(d+1)-6=0
We multiply parentheses
2d+2-6=0
We add all the numbers together, and all the variables
2d-4=0
We move all terms containing d to the left, all other terms to the right
2d=4
d=4/2
d=2
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