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2.3n-12+1.2n=9n=
We move all terms to the left:
2.3n-12+1.2n-(9n)=0
We add all the numbers together, and all the variables
-5.5n-12=0
We move all terms containing n to the left, all other terms to the right
-5.5n=12
n=12/-5.5
n=-2+1/5.5
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