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12=5d/13
We move all terms to the left:
12-(5d/13)=0
We add all the numbers together, and all the variables
-(+5d/13)+12=0
We get rid of parentheses
-5d/13+12=0
We multiply all the terms by the denominator
-5d+12*13=0
We add all the numbers together, and all the variables
-5d+156=0
We move all terms containing d to the left, all other terms to the right
-5d=-156
d=-156/-5
d=31+1/5
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