What is the answer to 8/a = 21/42 ?

The answer to 8/a = 21/42 is a=16

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8/a = 21/42

\frac{8}{a} = \frac{21}{42}

a = 16

Solution steps

\frac{8}{a} = \frac{21}{42}

Cross multiply

336 = a \cdot 21

Switch sides

a \cdot 21 = 336

Divide both sides by

21

a = 16

Verify Solutions

Find undefined (singularity) points:

a = 0

Combine undefined points with solutions:

a = 16

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

\frac{- 3}{2 x} + \frac{6}{x} = - 9

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

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

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