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3.5d+2=4.5+d
We move all terms to the left:
3.5d+2-(4.5+d)=0
We add all the numbers together, and all the variables
3.5d-(d+4.5)+2=0
We get rid of parentheses
3.5d-d-4.5+2=0
We add all the numbers together, and all the variables
2.5d-2.5=0
We move all terms containing d to the left, all other terms to the right
2.5d=2.5
d=2.5/2.5
d=1
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