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12n-5=7n+50
We move all terms to the left:
12n-5-(7n+50)=0
We get rid of parentheses
12n-7n-50-5=0
We add all the numbers together, and all the variables
5n-55=0
We move all terms containing n to the left, all other terms to the right
5n=55
n=55/5
n=11
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