Verified answer

28x^2y^3+14x^2y-7xy/7xy

= 28x^2y^3/7xy + 14x^2y/7xy - 7xy/7xy

= 4xy^2 + 14x - 1

(28x^2y^3 + 14x^2y - 7xy)/(7xy)

= [7xy(4xy^2) + 7xy(2x) - 7xy(1)]/(7xy)

= [7xy(4xy^2 + 2x - 1)]/(7xy)

= 4xy^2 + 2x - 1

4xy^2 + 14x - 1