3n+5=21-n

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Solution for 3n+5=21-n equation:


Simplifying
3n + 5 = 21 + -1n

Reorder the terms:
5 + 3n = 21 + -1n

Solving
5 + 3n = 21 + -1n

Solving for variable 'n'.

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

Add 'n' to each side of the equation.
5 + 3n + n = 21 + -1n + n

Combine like terms: 3n + n = 4n
5 + 4n = 21 + -1n + n

Combine like terms: -1n + n = 0
5 + 4n = 21 + 0
5 + 4n = 21

Add '-5' to each side of the equation.
5 + -5 + 4n = 21 + -5

Combine like terms: 5 + -5 = 0
0 + 4n = 21 + -5
4n = 21 + -5

Combine like terms: 21 + -5 = 16
4n = 16

Divide each side by '4'.
n = 4

Simplifying
n = 4

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