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42=4d+61/2
We move all terms to the left:
42-(4d+61/2)=0
We add all the numbers together, and all the variables
-(+4d+61/2)+42=0
We get rid of parentheses
-4d+42-61/2=0
We multiply all the terms by the denominator
-4d*2-61+42*2=0
We add all the numbers together, and all the variables
-4d*2+23=0
Wy multiply elements
-8d+23=0
We move all terms containing d to the left, all other terms to the right
-8d=-23
d=-23/-8
d=2+7/8
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