5n+21=2n+12

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Solution for 5n+21=2n+12 equation: 



5n+21=2n+12

We move all terms to the left:

5n+21-(2n+12)=0

We get rid of parentheses

5n-2n-12+21=0

We add all the numbers together, and all the variables

3n+9=0

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

3n=-9

n=-9/3

n=-3

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