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b)12+5=17 (-12)+5=-7 12+(-5)=7 (-12)+(-5)=-17
c)6+7=13 (-6)+7=1 6+(-7)=-1 (-6)+(-7)=-13
d)4+8=12 (-4)+8=4 4+(-8)=-4 (-4)+(-8)=-12
e)13+2=15 (-13)+2=-11 13+(-2)=11 (-13)+(-2)= -15