Set the denominator in equal to to find where the expression is undefined.

Subtract from both sides of the equation.

Multiply each term in by

Multiply each term in by .

Multiply .

Multiply by .

Multiply by .

Multiply by .

The domain is all values of that make the expression defined.

Interval Notation:

Set-Builder Notation:

Find the Domain f(x)=(7x)/(9-x)