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-3.5+2n=2
We move all terms to the left:
-3.5+2n-(2)=0
We add all the numbers together, and all the variables
2n-5.5=0
We move all terms containing n to the left, all other terms to the right
2n=5.5
n=5.5/2
n=2+1/1.3333333333333
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