3n-21=n+9

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Solution for 3n-21=n+9 equation:


Simplifying
3n + -21 = n + 9

Reorder the terms:
-21 + 3n = n + 9

Reorder the terms:
-21 + 3n = 9 + n

Solving
-21 + 3n = 9 + 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 + 3n + -1n = 9 + n + -1n

Combine like terms: 3n + -1n = 2n
-21 + 2n = 9 + n + -1n

Combine like terms: n + -1n = 0
-21 + 2n = 9 + 0
-21 + 2n = 9

Add '21' to each side of the equation.
-21 + 21 + 2n = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 2n = 9 + 21
2n = 9 + 21

Combine like terms: 9 + 21 = 30
2n = 30

Divide each side by '2'.
n = 15

Simplifying
n = 15

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