For which value(s) of x are (3 + x)/(5 + x) and (1 + x)/(2 + x) equal?
(3 + x)/(5 + x) = (1 + x)/(2 + x)
(x+3)(x+2) = (x+1)(x+5)
x^2 + 5x + 6 = x^2 + 6x + 5
1 = x