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7n+4n-8+3n-2n=30
We move all terms to the left:
7n+4n-8+3n-2n-(30)=0
We add all the numbers together, and all the variables
12n-38=0
We move all terms containing n to the left, all other terms to the right
12n=38
n=38/12
n=3+1/6
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