8a-9=9a

Solution for 8a-9=9a equation:

Simplifying
8a + -9 = 9a

Reorder the terms:
-9 + 8a = 9a

Solving
-9 + 8a = 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
-9 + 8a + -9a = 9a + -9a

Combine like terms: 8a + -9a = -1a
-9 + -1a = 9a + -9a

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

Add '9' to each side of the equation.
-9 + 9 + -1a = 0 + 9

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

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

Divide each side by '-1'.
a = -9

Simplifying
a = -9