x+15=x+21

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Solution for x+15=x+21 equation: 


Simplifying
x + 15 = x + 21

Reorder the terms:
15 + x = x + 21

Reorder the terms:
15 + x = 21 + x

Add '-1x' to each side of the equation.
15 + x + -1x = 21 + x + -1x

Combine like terms: x + -1x = 0
15 + 0 = 21 + x + -1x
15 = 21 + x + -1x

Combine like terms: x + -1x = 0
15 = 21 + 0
15 = 21

Solving
15 = 21

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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