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7+(d-2)=42
We move all terms to the left:
7+(d-2)-(42)=0
We add all the numbers together, and all the variables
(d-2)-35=0
We get rid of parentheses
d-2-35=0
We add all the numbers together, and all the variables
d-37=0
We move all terms containing d to the left, all other terms to the right
d=37
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