Add the following:
7
+
(
−
8
)
\displaystyle {7}+{\left(-{8}\right)}
7
+
(
−
8
)
=
−
7
+
(
−
8
)
\displaystyle -{7}+{\left(-{8}\right)}
−
7
+
(
−
8
)
=
7
+
8
\displaystyle {7}+{8}
7
+
8
=
−
7
+
8
\displaystyle -{7}+{8}
−
7
+
8
=
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