the equation is:
[tex]\frac{18x^3y^3+27x^2y-36xy^2+45xy}{9xy}[/tex]Now if you realise all the numbers in the numerator are multiples of 9, and also all terms have at least one x and one y, so we can take a common factor:
[tex]\frac{9xy(2x^2y^2+3x-4y+5)}{9xy}[/tex]if you want to prove this, you can use the distribution propertie. and now we can simplify the equation:
[tex]2x^2y^2+3x-4y+5[/tex]