What is the answer to 6/8 =(21)/b ?

The answer to 6/8 =(21)/b is b=28

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6/8 =(21)/b

\frac{6}{8} = \frac{21}{b}

b = 28

Solution steps

\frac{6}{8} = \frac{21}{b}

Cross multiply

6 b = 168

Divide both sides by

6

b = 28

Verify Solutions

Find undefined (singularity) points:

b = 0

Combine undefined points with solutions:

b = 28

\frac{x}{11} = \frac{4}{11 x}

\frac{7}{2 x} - \frac{1}{5 x} = 1

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

1 + \frac{3}{x + 4} = \frac{8 x}{x + 4}

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