-3n+21=-3n

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


Simplifying
-3n + 21 = -3n

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

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

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

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

Solving
21 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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