(
-
7
)
+
(
+
14
)
=
+
____________________
(
-
3
)
-
(
-
6
)
=
+
____________________
(
-
9
)
+
(
+
13
)
=
+
____________________
(
-
34
)
+
(
-
56
)
=
-
____________________
(
+
36
)
-
(
-
67
)
=
+
____________________
(
-
76
)
+
(
+
67
)
=
-
____________________
RETO
(
-
342
)
-
(
+
675
)
=
-
____________________
