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4n-122=5n+15
We move all terms to the left:
4n-122-(5n+15)=0
We get rid of parentheses
4n-5n-15-122=0
We add all the numbers together, and all the variables
-1n-137=0
We move all terms containing n to the left, all other terms to the right
-n=137
n=137/-1
n=-137
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