A equals open parentheses table row 1 row 2 row 3 end table close parentheses space space space space comma space space space B equals open parentheses table row cell 1 space space space end cell cell 2 space space space end cell 0 end table close parentheses فان A minus B equals
open parentheses table row 0 row 0 row cell negative 3 end cell end table close parentheses
open parentheses table row 2 row 4 row 3 end table close parentheses
open parentheses table row cell 0 space space space end cell cell 0 space space space end cell cell negative 3 end cell end table close parentheses
right to left ϕ