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30+.15n=15+.20n
We move all terms to the left:
30+.15n-(15+.20n)=0
We add all the numbers together, and all the variables
.15n-(.20n+15)+30=0
We get rid of parentheses
.15n-.20n-15+30=0
We add all the numbers together, and all the variables
-0.05n+15=0
We move all terms containing n to the left, all other terms to the right
-0.05n=-15
n=-15/-0.05
n=+300
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