21=4n-3-n

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Solution for 21=4n-3-n equation:


Simplifying
21 = 4n + -3 + -1n

Reorder the terms:
21 = -3 + 4n + -1n

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

Solving
21 = -3 + 3n

Solving for variable 'n'.

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

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

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

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

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

Combine like terms: -3 + -21 = -24
-3n = -24

Divide each side by '-3'.
n = 8

Simplifying
n = 8

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