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2(2d+1)-d=-13
We move all terms to the left:
2(2d+1)-d-(-13)=0
We add all the numbers together, and all the variables
-1d+2(2d+1)+13=0
We multiply parentheses
-1d+4d+2+13=0
We add all the numbers together, and all the variables
3d+15=0
We move all terms containing d to the left, all other terms to the right
3d=-15
d=-15/3
d=-5
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