4n-21=n-3

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


Simplifying
4n + -21 = n + -3

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

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

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

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

Combine like terms: n + -1n = 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 = 18
3n = 18

Divide each side by '3'.
n = 6

Simplifying
n = 6

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