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23-7d=3d+8
We move all terms to the left:
23-7d-(3d+8)=0
We get rid of parentheses
-7d-3d-8+23=0
We add all the numbers together, and all the variables
-10d+15=0
We move all terms containing d to the left, all other terms to the right
-10d=-15
d=-15/-10
d=1+1/2
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