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5n-10=3n-21
We move all terms to the left:
5n-10-(3n-21)=0
We get rid of parentheses
5n-3n+21-10=0
We add all the numbers together, and all the variables
2n+11=0
We move all terms containing n to the left, all other terms to the right
2n=-11
n=-11/2
n=-5+1/2
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