Add and simplify:

$\displaystyle \frac{{{x}^{{2}}-{x}}}{{{x}^{{2}}+{7}{x}}}+\frac{{{x}^{{2}}+{8}{x}}}{{{x}^{{2}}+{7}{x}}}$

Enter the numerator and denominator separately in the boxes below. If the denominator is 1, enter the number 1. Do not leave either box blank. Answer:
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