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2-5n+2n=13-77
We move all terms to the left:
2-5n+2n-(13-77)=0
We add all the numbers together, and all the variables
-5n+2n+2-(-64)=0
We add all the numbers together, and all the variables
-3n+66=0
We move all terms containing n to the left, all other terms to the right
-3n=-66
n=-66/-3
n=+22
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