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2+4.2n=5.25
We move all terms to the left:
2+4.2n-(5.25)=0
We add all the numbers together, and all the variables
4.2n-3.25=0
We move all terms containing n to the left, all other terms to the right
4.2n=3.25
n=3.25/4.2
n=2.6/3.36
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