# Prerequisites - P.5 - Rational Expressions - Exercises - Page 48: 19

-1/2, $x\ne5$

#### Work Step by Step

Expression : $\frac{x-5}{10-2x} = \frac{-(5-x)}{2(5-x)} = \frac{-1}{2}$ with x≠5 as x=5 would make the denominator in the original expression zero and division by 0 is not allowed.

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