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2(d+1)=5d+-7
We move all terms to the left:
2(d+1)-(5d+-7)=0
We add all the numbers together, and all the variables
2(d+1)-(5d-7)=0
We multiply parentheses
2d-(5d-7)+2=0
We get rid of parentheses
2d-5d+7+2=0
We add all the numbers together, and all the variables
-3d+9=0
We move all terms containing d to the left, all other terms to the right
-3d=-9
d=-9/-3
d=+3
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