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140+.50n=80+.60n
We move all terms to the left:
140+.50n-(80+.60n)=0
We add all the numbers together, and all the variables
.50n-(.60n+80)+140=0
We get rid of parentheses
.50n-.60n-80+140=0
We add all the numbers together, and all the variables
-0.1n+60=0
We move all terms containing n to the left, all other terms to the right
-0.1n=-60
n=-60/-0.1
n=+600
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