n+21=4n

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Solution for n+21=4n equation:


Simplifying
n + 21 = 4n

Reorder the terms:
21 + n = 4n

Solving
21 + n = 4n

Solving for variable 'n'.

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

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

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

Combine like terms: 4n + -4n = 0
21 + -3n = 0

Add '-21' to each side of the equation.
21 + -21 + -3n = 0 + -21

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

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

Divide each side by '-3'.
n = 7

Simplifying
n = 7

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