18. $$ \frac{x}{x-5}-\frac{x-5}{x} $$

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Calculate or simplify the expression $$ (x/(x-5)) - ((x-5)/x) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(\frac{x}{\left(x-5ight)}ight)-\left(\frac{\left(x-5ight)}{x}ight)$$
- step1: Remove the parentheses:
  $$\left(\frac{x}{x-5}ight)-\left(\frac{x-5}{x}ight)$$
- step2: Remove the parentheses:
  $$\frac{x}{x-5}-\left(\frac{x-5}{x}ight)$$
- step3: Remove the parentheses:
  $$\frac{x}{x-5}-\frac{x-5}{x}$$
- step4: Reduce fractions to a common denominator:
  $$\frac{x	imes x}{\left(x-5ight)x}-\frac{\left(x-5ight)\left(x-5ight)}{x\left(x-5ight)}$$
- step5: Rewrite the expression:
  $$\frac{x	imes x}{\left(x-5ight)x}-\frac{\left(x-5ight)\left(x-5ight)}{\left(x-5ight)x}$$
- step6: Transform the expression:
  $$\frac{x	imes x-\left(x-5ight)\left(x-5ight)}{\left(x-5ight)x}$$
- step7: Multiply the terms:
  $$\frac{x^{2}-\left(x-5ight)\left(x-5ight)}{\left(x-5ight)x}$$
- step8: Multiply the terms:
  $$\frac{x^{2}-\left(x^{2}-10x+25ight)}{\left(x-5ight)x}$$
- step9: Subtract the terms:
  $$\frac{10x-25}{\left(x-5ight)x}$$
- step10: Multiply the terms:
  $$\frac{10x-25}{x^{2}-5x}$$
The simplified form of the expression $$ \frac{x}{x-5}-\frac{x-5}{x} $$ is $$ \frac{10x-25}{x^{2}-5x} $$.
The simplified form of the expression is $$ \frac{10x-25}{x^{2}-5x} $$.

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