(7-(-1-(3-(2-5))+3)-2)=
(7-(-1-(3-(-3))+3)-2)=
(7-(-1-(3 + 3))+3)-2)=
(7-(-1 - 6+3)-2)=
(7-(-4)-2)=
7 + 4 - 2=
9
(7-(-1-(3-(2-5))+3)-2)=
(7-(-1-(3-(-3))+3)-2)=
(7-(-1-(3 + 3))+3)-2)=
(7-(-1 - 6+3)-2)=
(7-(-4)-2)=
7 + 4 - 2=
9