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b. -50+50=0
c. -12+12=0
d. -18+18=0
e. -7+14+(-7)=0
x= -65
B.-50+x=0
x=50
C.-x+12=0
-x=-12
x=12
D.-18+(-x)=0
-x=18
x=-18
E.-7+14+(-x)=0
-x+7=0
-x=-7
x=7