Write an equation for the following:
If one-tenth of a number $x$ is subtracted from seven times the number, then the result is $138$ .

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Solution

One-tenth of a number $x$ is $\frac{1}{10} x$ and seven times the number $x$ is $7 x$ .
Now, to subtract one-tenth of a number $x$ from seven times the number is $7 x - \frac{1}{10} x$
Hence, the required equation is $7 x - \frac{1}{10} x = 138$ .

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