(xy-ab-9)-(xy-9ab-5)=

Solution for (xy-ab-9)-(xy-9ab-5)= equation:

Simplifying
(xy + -1ab + -9) + -1(xy + -9ab + -5) = 0

Reorder the terms:
(-9 + -1ab + xy) + -1(xy + -9ab + -5) = 0

Remove parenthesis around (-9 + -1ab + xy)
-9 + -1ab + xy + -1(xy + -9ab + -5) = 0

Reorder the terms:
-9 + -1ab + xy + -1(-5 + -9ab + xy) = 0
-9 + -1ab + xy + (-5 * -1 + -9ab * -1 + xy * -1) = 0
-9 + -1ab + xy + (5 + 9ab + -1xy) = 0

Reorder the terms:
-9 + 5 + -1ab + 9ab + xy + -1xy = 0

Combine like terms: -9 + 5 = -4
-4 + -1ab + 9ab + xy + -1xy = 0

Combine like terms: -1ab + 9ab = 8ab
-4 + 8ab + xy + -1xy = 0

Combine like terms: xy + -1xy = 0
-4 + 8ab + 0 = 0
-4 + 8ab = 0

Solving
-4 + 8ab = 0

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 4 + 8ab = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 8ab = 0 + 4
8ab = 0 + 4

Combine like terms: 0 + 4 = 4
8ab = 4

Divide each side by '8b'.
a = 0.5b-1

Simplifying
a = 0.5b-1