Question

The LCD of theses fractions?

y/x + y/3+ y+1/y

Answers:
3x+y
x+3+y
3x+y

Answer 1

3xy

y(3y)/3xy + y(xy)/3xy + (y+1)(3x)/3xy

NOW since all of the fractions have a denominator of 3xy, drop the denominators and solve using the numerators.

y(3y) + y(xy) + (y+1)(3x)

3y^2 + xy^2 + 3xy +3x

cannot simplify further.