-21=3n

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Solution for -21=3n equation:


Simplifying
-21 = 3n

Solving
-21 = 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 = 3n + -3n

Combine like terms: 3n + -3n = 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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