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11d-121=-1+d
We move all terms to the left:
11d-121-(-1+d)=0
We add all the numbers together, and all the variables
11d-(d-1)-121=0
We get rid of parentheses
11d-d+1-121=0
We add all the numbers together, and all the variables
10d-120=0
We move all terms containing d to the left, all other terms to the right
10d=120
d=120/10
d=12
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