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

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



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

We move all terms to the left:

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

We multiply parentheses

32n+6n-3-21=0

We add all the numbers together, and all the variables

38n-24=0

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

38n=24

n=24/38

n=12/19

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