9-2a=a-a

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Solution for 9-2a=a-a equation: 


Simplifying
9 + -2a = a + -1a

Combine like terms: a + -1a = 0
9 + -2a = 0

Solving
9 + -2a = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + -2a = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -2a = 0 + -9
-2a = 0 + -9

Combine like terms: 0 + -9 = -9
-2a = -9

Divide each side by '-2'.
a = 4.5

Simplifying
a = 4.5

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