3(2n+5)-4n=21

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Solution for 3(2n+5)-4n=21 equation: 



3(2n+5)-4n=21

We move all terms to the left:

3(2n+5)-4n-(21)=0

We add all the numbers together, and all the variables

-4n+3(2n+5)-21=0

We multiply parentheses

-4n+6n+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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