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30=7n-5
We move all terms to the left:
30-(7n-5)=0
We get rid of parentheses
-7n+5+30=0
We add all the numbers together, and all the variables
-7n+35=0
We move all terms containing n to the left, all other terms to the right
-7n=-35
n=-35/-7
n=+5
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