Respuesta :

4+8+(5X7)+5(7-9)=6+B
USE PEMDAS
5X7=35
4+8+35+5(7-9)=6+B
(7-9)=-2
4+8+35+5(-2)=6+B
5X-2=-10
4+8+35+-10=6+B
4+8+35+-10=37
minus both sides by 6
37-6=31
6+B-6=B
31=B or B=31