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-13=2n+3
We move all terms to the left:
-13-(2n+3)=0
We get rid of parentheses
-2n-3-13=0
We add all the numbers together, and all the variables
-2n-16=0
We move all terms containing n to the left, all other terms to the right
-2n=16
n=16/-2
n=-8
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