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3n-2.7=-4.5
We move all terms to the left:
3n-2.7-(-4.5)=0
We add all the numbers together, and all the variables
3n+1.8=0
We move all terms containing n to the left, all other terms to the right
3n=-1.8
n=-1.8/3
n=-1/1.6666666666667
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