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12=2n-3
We move all terms to the left:
12-(2n-3)=0
We get rid of parentheses
-2n+3+12=0
We add all the numbers together, and all the variables
-2n+15=0
We move all terms containing n to the left, all other terms to the right
-2n=-15
n=-15/-2
n=7+1/2
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