5n+21=3n+39

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Solution for 5n+21=3n+39 equation: 



5n+21=3n+39

We move all terms to the left:

5n+21-(3n+39)=0

We get rid of parentheses

5n-3n-39+21=0

We add all the numbers together, and all the variables

2n-18=0

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

2n=18

n=18/2

n=9

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