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13=d.6
We move all terms to the left:
13-(d.6)=0
We add all the numbers together, and all the variables
-(+d.6)+13=0
We get rid of parentheses
-d.6+13=0
We move all terms containing d to the left, all other terms to the right
-d.6=-13
d=-13/1
d=-13
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