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-13=-2n+5
We move all terms to the left:
-13-(-2n+5)=0
We get rid of parentheses
2n-5-13=0
We add all the numbers together, and all the variables
2n-18=0
We move all terms containing n to the left, all other terms to the right
2n=18
n=18/2
n=9
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