Divide and simplify:

x21x56x264÷x2+13x+42x236\displaystyle \frac{{{x}^{{2}}-{1}{x}-{56}}}{{{x}^{{2}}-{64}}}\div\frac{{{x}^{{2}}+{13}{x}+{42}}}{{{x}^{{2}}-{36}}}


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: