Approximating solution of fully fuzzy linear systems in dual form

In this paper, we propose a method to obtain fuzzy solutions of duality fully fuzzy linear system (dffls) ofthe form ~ a ~x = ~b~x+ ~ c; where ~ a; ~b are fuzzy matrices and ~ c; ~x are fuzzy number vectors. to this end, wesolve the 1-cut of dffls (which is a crisp system here) ,then some unknown spreads are allocated to any rowof a 1-cut of dual fully fuzzy linear system in 1-cut position. also, by using this method we determine fuzzysolutions will be placed in the tolerable solution set (tss) and in the controllable solution set (css).