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2+3.50d=5+3.25d
We move all terms to the left:
2+3.50d-(5+3.25d)=0
We add all the numbers together, and all the variables
3.50d-(3.25d+5)+2=0
We get rid of parentheses
3.50d-3.25d-5+2=0
We add all the numbers together, and all the variables
0.25d-3=0
We move all terms containing d to the left, all other terms to the right
0.25d=3
d=3/0.25
d=12
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