[tex] A = 3 - ( - 4) + ( - 2) - 6 \\ \\ A = (3 + 4) + ( - 2 - 6) \\ \\ A = 7 - 8 \\ \\ A = \boxed{ - 1}[/tex]
[tex] B = - 2 + ( - 7) - 8 - ( - 2) \\ \\ B = (- 2 - 7 - 8) + 2 \\ \\ B = - 17 + 2 \\ \\ B = \boxed{- 15}[/tex]
[tex] \big\{A = - 1 , B = - 15 \big\}[/tex]