calcule
a) (+11) + (-9)=
b) (-72) + (+60)=
c) (+130) + (-30)=
d) (-75) + (+48)=
e) (-21) + (+20)=
f) (-100) + (+109)=
g) (+91) + (-221)=
h) (-85) + (+100)=
i) (-63) + (+98)=
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