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-d-1=-3d+6
We move all terms to the left:
-d-1-(-3d+6)=0
We add all the numbers together, and all the variables
-1d-(-3d+6)-1=0
We get rid of parentheses
-1d+3d-6-1=0
We add all the numbers together, and all the variables
2d-7=0
We move all terms containing d to the left, all other terms to the right
2d=7
d=7/2
d=3+1/2
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