4n+21=2n+15

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Solution for 4n+21=2n+15 equation: 



4n+21=2n+15

We move all terms to the left:

4n+21-(2n+15)=0

We get rid of parentheses

4n-2n-15+21=0

We add all the numbers together, and all the variables

2n+6=0

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

2n=-6

n=-6/2

n=-3

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