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2.5(d-5)=65
We move all terms to the left:
2.5(d-5)-(65)=0
We multiply parentheses
2.5d-12.5-65=0
We add all the numbers together, and all the variables
2.5d-77.5=0
We move all terms containing d to the left, all other terms to the right
2.5d=77.5
d=77.5/2.5
d=31
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