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d/2-8=12
We move all terms to the left:
d/2-8-(12)=0
We add all the numbers together, and all the variables
d/2-20=0
We multiply all the terms by the denominator
d-20*2=0
We add all the numbers together, and all the variables
d-40=0
We move all terms containing d to the left, all other terms to the right
d=40
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