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(-47)=-47
+(-18)=-18
-15=-15
-(-18)=+18
+47=47
-47-18-15+18+47= -15
- x - = +
+x+= +
-x+= -
+x-= - aprende ley de signos
-47 -18 -15 +18 +47
-65 -15 +18 +47
-80 +18 +47
-62 +47
-15