a+9=a-9

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Solution for a+9=a-9 equation: 


Simplifying
a + 9 = a + -9

Reorder the terms:
9 + a = a + -9

Reorder the terms:
9 + a = -9 + a

Add '-1a' to each side of the equation.
9 + a + -1a = -9 + a + -1a

Combine like terms: a + -1a = 0
9 + 0 = -9 + a + -1a
9 = -9 + a + -1a

Combine like terms: a + -1a = 0
9 = -9 + 0
9 = -9

Solving
9 = -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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