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2.25(k-65)=
We move all terms to the left:
2.25(k-65)-()=0
We add all the numbers together, and all the variables
2.25(k-65)=0
We multiply parentheses
2.25k-146.25=0
We move all terms containing k to the left, all other terms to the right
2.25k=146.25
k=146.25/2.25
k=65
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