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30=0.5n+28
We move all terms to the left:
30-(0.5n+28)=0
We get rid of parentheses
-0.5n-28+30=0
We add all the numbers together, and all the variables
-0.5n+2=0
We move all terms containing n to the left, all other terms to the right
-0.5n=-2
n=-2/-0.5
n=+4
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