What is the answer to 4/(10.5)= 8/x ?

The answer to 4/(10.5)= 8/x is x=21

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4/(10.5)= 8/x

\frac{4}{10.5} = \frac{8}{x}

x = 21

Solution steps

\frac{4}{10.5} = \frac{8}{x}

Cross multiply

4 x = 84

Divide both sides by

4

x = 21

Verify Solutions

Find undefined (singularity) points:

x = 0

Combine undefined points with solutions:

x = 21

\frac{2 x}{x + 2} = 9 - \frac{4}{x + 2}

\frac{4}{2 + 3 s} - \frac{2}{5} = - 6

\frac{8}{y} = 4

x, \frac{f - 2}{x - 1} = 6

x, z = \frac{x - y}{x + y}