55=13+-7n

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Solution for 55=13+-7n equation: 



55=13+-7n

We move all terms to the left:

55-(13+-7n)=0

We add all the numbers together, and all the variables

-(-7n)+55=0

We get rid of parentheses

7n+55=0

We move all terms containing n to the left, all other terms to the right

7n=-55

n=-55/7

n=-7+6/7

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