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0.5n+7+n=20
We move all terms to the left:
0.5n+7+n-(20)=0
We add all the numbers together, and all the variables
1.5n-13=0
We move all terms containing n to the left, all other terms to the right
1.5n=13
n=13/1.5
n=8+1/1.5
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