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13-9=d-6
We move all terms to the left:
13-9-(d-6)=0
We add all the numbers together, and all the variables
-(d-6)+4=0
We get rid of parentheses
-d+6+4=0
We add all the numbers together, and all the variables
-1d+10=0
We move all terms containing d to the left, all other terms to the right
-d=-10
d=-10/-1
d=+10
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