7+7+7=21

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Solution for 7+7+7=21 equation: 


Simplifying
7 + 7 + 7 = 21

Combine like terms: 7 + 7 = 14
14 + 7 = 21

Combine like terms: 14 + 7 = 21
21 = 21

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

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

Combine like terms: 21 + -21 = 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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