What is the answer to 4/x = 2/21 ?

The answer to 4/x = 2/21 is x=42

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4/x = 2/21

\frac{4}{x} = \frac{2}{21}

x = 42

Solution steps

\frac{4}{x} = \frac{2}{21}

Cross multiply

84 = x \cdot 2

Switch sides

x \cdot 2 = 84

Divide both sides by

2

x = 42

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 42

\frac{x ^{2} - 3 x - 10}{1 - x} = 2

x^{- 2} + 2 x + 1 = 0

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

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

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