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12(d-13)=-12
We move all terms to the left:
12(d-13)-(-12)=0
We add all the numbers together, and all the variables
12(d-13)+12=0
We multiply parentheses
12d-156+12=0
We add all the numbers together, and all the variables
12d-144=0
We move all terms containing d to the left, all other terms to the right
12d=144
d=144/12
d=12
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