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a) -26+48 = 22
b) -3-1+16 = -4+16 = 12
c) 67+24-81 = 91-81 = 10
d) -3+(-3) = -3-3 = -6
e) -12-(-15-2-3) = -12-(-17-3) = -12-(-20) = -12+20 = 8
3.
a) 7-8
b) 13-15