An object, that remains at rest, is acted upon by three forces F1, F2 and F3. The component forms of F1 and F2 are given by
F1 =ai + bj and F2 = ci + dj
where a = -116, b = 50, c = 129 and d = -195. If the component form of F3 is of the form
F3 = xi + yj
then what is the value of x?