21x+15=21x-9

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Solution for 21x+15=21x-9 equation:


Simplifying
21x + 15 = 21x + -9

Reorder the terms:
15 + 21x = 21x + -9

Reorder the terms:
15 + 21x = -9 + 21x

Add '-21x' to each side of the equation.
15 + 21x + -21x = -9 + 21x + -21x

Combine like terms: 21x + -21x = 0
15 + 0 = -9 + 21x + -21x
15 = -9 + 21x + -21x

Combine like terms: 21x + -21x = 0
15 = -9 + 0
15 = -9

Solving
15 = -9

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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