3n-21=2n

Solution for 3n-21=2n equation:

Simplifying
3n + -21 = 2n

Reorder the terms:
-21 + 3n = 2n

Solving
-21 + 3n = 2n

Solving for variable 'n'.

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

Add '-2n' to each side of the equation.
-21 + 3n + -2n = 2n + -2n

Combine like terms: 3n + -2n = 1n
-21 + 1n = 2n + -2n

Combine like terms: 2n + -2n = 0
-21 + 1n = 0

Add '21' to each side of the equation.
-21 + 21 + 1n = 0 + 21

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

Combine like terms: 0 + 21 = 21
1n = 21

Divide each side by '1'.
n = 21

Simplifying
n = 21