4n-21=6+n

Solution for 4n-21=6+n equation:

Simplifying
4n + -21 = 6 + n

Reorder the terms:
-21 + 4n = 6 + n

Solving
-21 + 4n = 6 + n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-1n' to each side of the equation.
-21 + 4n + -1n = 6 + n + -1n

Combine like terms: 4n + -1n = 3n
-21 + 3n = 6 + n + -1n

Combine like terms: n + -1n = 0
-21 + 3n = 6 + 0
-21 + 3n = 6

Add '21' to each side of the equation.
-21 + 21 + 3n = 6 + 21

Combine like terms: -21 + 21 = 0
0 + 3n = 6 + 21
3n = 6 + 21

Combine like terms: 6 + 21 = 27
3n = 27

Divide each side by '3'.
n = 9

Simplifying
n = 9