20=(40)/z

Solution

20 = \frac{40}{z}

z = 2

Solution steps

20 = \frac{40}{z}

Multiply both sides by

z

20 z = 40

Divide both sides by

20

z = 2

Verify Solutions

Find undefined (singularity) points:

z = 0

Combine undefined points with solutions:

z = 2

\frac{x - 3}{x - 4} = 1

\frac{m}{x} - 18 = b

x - \frac{18}{x} = 3

\frac{x - 1}{5} = \frac{1}{x + 3}

\frac{2 π}{x} = π