18-a=a

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Solution for 18-a=a equation:


Simplifying
18 + -1a = a

Solving
18 + -1a = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
18 + -1a + -1a = a + -1a

Combine like terms: -1a + -1a = -2a
18 + -2a = a + -1a

Combine like terms: a + -1a = 0
18 + -2a = 0

Add '-18' to each side of the equation.
18 + -18 + -2a = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -2a = 0 + -18
-2a = 0 + -18

Combine like terms: 0 + -18 = -18
-2a = -18

Divide each side by '-2'.
a = 9

Simplifying
a = 9

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