Rewrite the division as a fraction.

Factor out of .

Factor out of .

Factor out of .

Factor out the greatest common factor from each group.

Group the first two terms and the last two terms.

Factor out the greatest common factor (GCF) from each group.

Factor the polynomial by factoring out the greatest common factor, .

Cancel the common factor.

Rewrite the expression.

Simplify (3a-18)÷(a^3-6a^2+3a-18)