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6(d+2)-2d=54
We move all terms to the left:
6(d+2)-2d-(54)=0
We add all the numbers together, and all the variables
-2d+6(d+2)-54=0
We multiply parentheses
-2d+6d+12-54=0
We add all the numbers together, and all the variables
4d-42=0
We move all terms containing d to the left, all other terms to the right
4d=42
d=42/4
d=10+1/2
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