21x-21=21x-21

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Solution for 21x-21=21x-21 equation: 


Simplifying
21x + -21 = 21x + -21

Reorder the terms:
-21 + 21x = 21x + -21

Reorder the terms:
-21 + 21x = -21 + 21x

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

Combine like terms: -21 + 21 = 0
0 + 21x = -21 + 21 + 21x
21x = -21 + 21 + 21x

Combine like terms: -21 + 21 = 0
21x = 0 + 21x
21x = 21x

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

Combine like terms: 21x + -21x = 0
0 = 21x + -21x

Combine like terms: 21x + -21x = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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