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40=2d+8
We move all terms to the left:
40-(2d+8)=0
We get rid of parentheses
-2d-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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