Two Planets Have Masses M and M, and the Ratio

Two planets have masses M and m, and the ratio M/m = 25. The distance between the planets is R. The point P is between the planets as shown, and the distance between M and P is x. At P the gravitational forces on an object due to M and m are equal in magnitude. The value of x is

A) 5R/6.
B) 25R/36.
C) R/25.
D) 6R/5.
E) None of these is correct.