3(2n+1)+2n=21

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Solution for 3(2n+1)+2n=21 equation: 



3(2n+1)+2n=21

We move all terms to the left:

3(2n+1)+2n-(21)=0

We add all the numbers together, and all the variables

2n+3(2n+1)-21=0

We multiply parentheses

2n+6n+3-21=0

We add all the numbers together, and all the variables

8n-18=0

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

8n=18

n=18/8

n=2+1/4

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