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-13=d/3
We move all terms to the left:
-13-(d/3)=0
We add all the numbers together, and all the variables
-(+d/3)-13=0
We get rid of parentheses
-d/3-13=0
We multiply all the terms by the denominator
-d-13*3=0
We add all the numbers together, and all the variables
-1d-39=0
We move all terms containing d to the left, all other terms to the right
-d=39
d=39/-1
d=-39
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