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d+(d+8)=40
We move all terms to the left:
d+(d+8)-(40)=0
We get rid of parentheses
d+d+8-40=0
We add all the numbers together, and all the variables
2d-32=0
We move all terms containing d to the left, all other terms to the right
2d=32
d=32/2
d=16
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