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a)15-4=11
B)-9+7=2
C)-5-8= -13
D)13-18= -5
BUENO CON ESTE YA ME VOY YO TAMBIEN TENGO QUE HACER TARA JEJEJEJEE
b) (-9) -(-7) = +16
c ) (-5) - (+18) =+13
d) (+13) - (+18) = +31