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13d-28=80+12
We move all terms to the left:
13d-28-(80+12)=0
We add all the numbers together, and all the variables
13d-28-92=0
We add all the numbers together, and all the variables
13d-120=0
We move all terms containing d to the left, all other terms to the right
13d=120
d=120/13
d=9+3/13
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