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a) 25-12-5 = 8
c)-12-5+18= 1
b) -25+(-5)-18= -48
d) 25-12-5+18=26
2)
a) 5+10+(-7)= 8
b) 10+4+3=17
c)2+18+(-5)=15
d) 21+85= 106