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4d-8=12-d
We move all terms to the left:
4d-8-(12-d)=0
We add all the numbers together, and all the variables
4d-(-1d+12)-8=0
We get rid of parentheses
4d+1d-12-8=0
We add all the numbers together, and all the variables
5d-20=0
We move all terms containing d to the left, all other terms to the right
5d=20
d=20/5
d=4
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