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6n+15=4n+19
We move all terms to the left:
6n+15-(4n+19)=0
We get rid of parentheses
6n-4n-19+15=0
We add all the numbers together, and all the variables
2n-4=0
We move all terms containing n to the left, all other terms to the right
2n=4
n=4/2
n=2
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