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10d+8=-6d+40
We move all terms to the left:
10d+8-(-6d+40)=0
We get rid of parentheses
10d+6d-40+8=0
We add all the numbers together, and all the variables
16d-32=0
We move all terms containing d to the left, all other terms to the right
16d=32
d=32/16
d=2
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