Replace the force system acting on the frame by an equivalent resultant force and couple moment acting at point A.
Given:
{ F }_{ 1 } = 35 Ib\quad a = 2 ft
{ F }{ 2 } = 20 Ib\quad b = 4 ft
{ F }_{ 3 } = 25 Ib\quad c = 3 ft
\theta = 30 deg\quad d = 2 ft