(-2)+(+5) - +3
(-6)+(-4)= - -10
-12+(+3-1)= - 10
15-[-2+(15+6)]= - 43
{+10-[15+(5)]}= - 20
+10-(10/2+5)= - 0
25-35X2= - 45
-40+(15/3)= - -35
+36-(-2+6)= - 32