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3n-5=4n-15
We move all terms to the left:
3n-5-(4n-15)=0
We get rid of parentheses
3n-4n+15-5=0
We add all the numbers together, and all the variables
-1n+10=0
We move all terms containing n to the left, all other terms to the right
-n=-10
n=-10/-1
n=+10
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