21=3(n-5)

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Solution for 21=3(n-5) equation:


Simplifying
21 = 3(n + -5)

Reorder the terms:
21 = 3(-5 + n)
21 = (-5 * 3 + n * 3)
21 = (-15 + 3n)

Solving
21 = -15 + 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 = -15 + 3n + -3n

Combine like terms: 3n + -3n = 0
21 + -3n = -15 + 0
21 + -3n = -15

Add '-21' to each side of the equation.
21 + -21 + -3n = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -3n = -15 + -21
-3n = -15 + -21

Combine like terms: -15 + -21 = -36
-3n = -36

Divide each side by '-3'.
n = 12

Simplifying
n = 12

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