a-9=-9+a

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Solution for a-9=-9+a equation: 


Simplifying
a + -9 = -9 + a

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

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

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

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

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

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

Combine like terms: a + -1a = 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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