Multiply the numerator by the reciprocal of the denominator.

To write as a fraction with a common denominator, multiply by .

To write as a fraction with a common denominator, multiply by .

Multiply and .

Multiply and .

Reorder the factors of .

Combine the numerators over the common denominator.

Multiply and .

Simplify (1/(3z)-1/(3y))/(1/(z+y))