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b. 12+(-7)+(-13)=12-7-13=-8
c. -8-25+7=-26
d. 18+(-3)-(-6)=18-3+6
e. -15-(-14)-(-20)=-15+14+20=19
f. -19+12-(-17)=-19+12+17=10
g. -6-15-20=-41
h. -10-(-8)-16=-10+8-6=-4