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(8-d)*2+81=100
We move all terms to the left:
(8-d)*2+81-(100)=0
We add all the numbers together, and all the variables
(-1d+8)*2+81-100=0
We add all the numbers together, and all the variables
(-1d+8)*2-19=0
We multiply parentheses
-2d+16-19=0
We add all the numbers together, and all the variables
-2d-3=0
We move all terms containing d to the left, all other terms to the right
-2d=3
d=3/-2
d=-1+1/2
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