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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

6n-(3n+21)+3=0

We get rid of parentheses

6n-3n-21+3=0

We add all the numbers together, and all the variables

3n-18=0

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

3n=18

n=18/3

n=6

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