6-a=8-(9+a)

Solution for 6-a=8-(9+a) equation:

Simplifying
6 + -1a = 8 + -1(9 + a)
6 + -1a = 8 + (9 * -1 + a * -1)
6 + -1a = 8 + (-9 + -1a)

Combine like terms: 8 + -9 = -1
6 + -1a = -1 + -1a

Add 'a' to each side of the equation.
6 + -1a + a = -1 + -1a + a

Combine like terms: -1a + a = 0
6 + 0 = -1 + -1a + a
6 = -1 + -1a + a

Combine like terms: -1a + a = 0
6 = -1 + 0
6 = -1

Solving
6 = -1

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.