21+u=6+u

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Solution for 21+u=6+u equation: 


Simplifying
21 + u = 6 + u

Add '-1u' to each side of the equation.
21 + u + -1u = 6 + u + -1u

Combine like terms: u + -1u = 0
21 + 0 = 6 + u + -1u
21 = 6 + u + -1u

Combine like terms: u + -1u = 0
21 = 6 + 0
21 = 6

Solving
21 = 6

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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