20-7n=-57

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Solution for 20-7n=-57 equation: 



20-7n=-57

We move all terms to the left:

20-7n-(-57)=0

We add all the numbers together, and all the variables

-7n+77=0

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

-7n=-77

n=-77/-7

n=+11

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