7n+21=5n+31

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Solution for 7n+21=5n+31 equation: 



7n+21=5n+31

We move all terms to the left:

7n+21-(5n+31)=0

We get rid of parentheses

7n-5n-31+21=0

We add all the numbers together, and all the variables

2n-10=0

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

2n=10

n=10/2

n=5

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