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39.99+.45n=49.99+.40n
We move all terms to the left:
39.99+.45n-(49.99+.40n)=0
We add all the numbers together, and all the variables
.45n-(.40n+49.99)+39.99=0
We get rid of parentheses
.45n-.40n-49.99+39.99=0
We add all the numbers together, and all the variables
0.05n-10=0
We move all terms containing n to the left, all other terms to the right
0.05n=10
n=10/0.05
n=200
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