Question 1070177
x+7/7x+5    ÷     x-8/x^2-3x-40
The quadratic factors into (x-8)(x+5), so the x-8 cancels and the divisor is 1/(x+5)
invert and multiply.
(x+7)(x+5)/(7x+5).  The (x+5) and the 7x+5 cannot cancel.