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2.5n+4.5=21.7
We move all terms to the left:
2.5n+4.5-(21.7)=0
We add all the numbers together, and all the variables
2.5n-17.2=0
We move all terms containing n to the left, all other terms to the right
2.5n=17.2
n=17.2/2.5
n=6+1/1.13636363636
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