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56=13+dd=
We move all terms to the left:
56-(13+dd)=0
We add all the numbers together, and all the variables
-(dd+13)+56=0
We get rid of parentheses
-dd-13+56=0
We add all the numbers together, and all the variables
-dd+43=0
We move all terms containing d to the left, all other terms to the right
-dd=-43
d=-43/1
d=-43
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