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13=1d+6
We move all terms to the left:
13-(1d+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 add all the numbers together, and all the variables
-1d+7=0
We move all terms containing d to the left, all other terms to the right
-d=-7
d=-7/-1
d=+7
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