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20+.05n=10+.07n
We move all terms to the left:
20+.05n-(10+.07n)=0
We add all the numbers together, and all the variables
.05n-(.07n+10)+20=0
We get rid of parentheses
.05n-.07n-10+20=0
We add all the numbers together, and all the variables
-0.02n+10=0
We move all terms containing n to the left, all other terms to the right
-0.02n=-10
n=-10/-0.02
n=+500
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