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2.5n-5=7.5
We move all terms to the left:
2.5n-5-(7.5)=0
We add all the numbers together, and all the variables
2.5n-12.5=0
We move all terms containing n to the left, all other terms to the right
2.5n=12.5
n=12.5/2.5
n=5
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