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d-1=-2d-10
We move all terms to the left:
d-1-(-2d-10)=0
We get rid of parentheses
d+2d+10-1=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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