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4=3d+13-6d
We move all terms to the left:
4-(3d+13-6d)=0
We add all the numbers together, and all the variables
-(-3d+13)+4=0
We get rid of parentheses
3d-13+4=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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