Simplify the expression.
(8a^(2)-63ab-81b^(2))/(8ab^(2) 9b^(3))
?
6. [-/ 1 Points] Perform the indicated operation and simplify the expression.
(4x^(2) 3x-1)/(2x 6) (x^(2)-1)/(x^(2) 2x-3)
7. [-/ 1 Points]