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 by .

Multiply and .

Multiply by .

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Reorder the factors of .

Combine the numerators over the common denominator.

Multiply by .

Simplify 7/(25z^3y)-1/(35z^2y)