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65=2.5d+d
We move all terms to the left:
65-(2.5d+d)=0
We add all the numbers together, and all the variables
-(+3.5d)+65=0
We get rid of parentheses
-3.5d+65=0
We move all terms containing d to the left, all other terms to the right
-3.5d=-65
d=-65/-3.5
d=18+2/3.5
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