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16(d+-1)=20
We move all terms to the left:
16(d+-1)-(20)=0
We add all the numbers together, and all the variables
16(d-1)-20=0
We multiply parentheses
16d-16-20=0
We add all the numbers together, and all the variables
16d-36=0
We move all terms containing d to the left, all other terms to the right
16d=36
d=36/16
d=2+1/4
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