(20)/x =4

Solution

\frac{20}{x} = 4

x = 5

Solution steps

\frac{20}{x} = 4

Multiply both sides by

x

20 = 4 x

Switch sides

4 x = 20

Divide both sides by

4

x = 5

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 5

\frac{x ^{2} + 7 x - 18}{x - 2} = 15

\frac{2 x + 3}{5} = \frac{45}{2 x + 3}

\frac{1}{q + 4} - \frac{2}{q - 2} = 1

3 x^{- 3} = 81

\frac{1}{x} = c - \frac{1}{a}