(21)/x =3

Solution

\frac{21}{x} = 3

x = 7

Solution steps

\frac{21}{x} = 3

Multiply both sides by

x

21 = 3 x

Switch sides

3 x = 21

Divide both sides by

3

x = 7

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 7

\frac{v - 3}{v - 1} = \frac{2}{v + 2}

x - \frac{2 x + 21}{x ^{2} - x + 3} = 5

\frac{5 x - 2}{x ^{2} + 4} = 1

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

1 + \frac{x}{x + 8} = - \frac{4}{x + 8}