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12=5n+-3
We move all terms to the left:
12-(5n+-3)=0
We add all the numbers together, and all the variables
-(5n-3)+12=0
We get rid of parentheses
-5n+3+12=0
We add all the numbers together, and all the variables
-5n+15=0
We move all terms containing n to the left, all other terms to the right
-5n=-15
n=-15/-5
n=+3
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