9+21=30

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Solution for 9+21=30 equation: 


Simplifying
9 + 21 = 30

Combine like terms: 9 + 21 = 30
30 = 30

Add '-30' to each side of the equation.
30 + -30 = 30 + -30

Combine like terms: 30 + -30 = 0
0 = 30 + -30

Combine like terms: 30 + -30 = 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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