A equals open parentheses table row cell 2 space space space end cell cell negative 3 end cell end table close parentheses فان negative 2 A equals
open parentheses table row cell negative 4 space space space end cell 6 end table close parentheses
open parentheses table row cell 4 space space space space end cell cell negative 6 end cell end table close parentheses
open parentheses table row cell 4 space space space space end cell 6 end table close parentheses
right to left empty set