Can the result of three unequal forces be equal to zero?

Suppose two forces of magnitude 3 newton and 2 newton are acting on the same point, at the same time and in the same direction (say AB) and at that time only another force of magnitude 5 newton is acting on that point in the opposite direction ( i.e. BA). read more

if by 'unequal' you are disregarding the sign (+ve/-ve) then no. 5N <---x---> 5N the resultant of the forces on the above block 'x' is 0 but the forces are equal (but in opposite directions). this is the only way to give a zero resultant with two forces (vectors). read more