
Variable x cannot be equal to −9 as division by zero is undefined. Multiply both sides of the equation by 20(x+9), the lowest common denominator of x+9,5,4.

Multiply 5 and 1/5 to get 4.

Use the distributive property to multiply 4 by x+9.

Add 20 and 36 to get 56.

Use the distributive property to multiply 5 by x+9.

Subtract 5x on both sides.

Combine 4x and −5x to get −x.

Subtract 56 from both sides.

Subtract 56 from 45 to get −11.

Multiply both sides by −1.
