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45=3n+15
We move all terms to the left:
45-(3n+15)=0
We get rid of parentheses
-3n-15+45=0
We add all the numbers together, and all the variables
-3n+30=0
We move all terms containing n to the left, all other terms to the right
-3n=-30
n=-30/-3
n=+10
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