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9.99+3.99n=50
We move all terms to the left:
9.99+3.99n-(50)=0
We add all the numbers together, and all the variables
3.99n-40.01=0
We move all terms containing n to the left, all other terms to the right
3.99n=40.01
n=40.01/3.99
n=10+0.10999999999999/3.99
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