Add the following:
−
3
+
(
−
7
)
\displaystyle -{3}+{\left(-{7}\right)}
−
3
+
(
−
7
)
=
−
3
+
7
\displaystyle -{3}+{7}
−
3
+
7
=
3
+
(
−
7
)
\displaystyle {3}+{\left(-{7}\right)}
3
+
(
−
7
)
=
3
+
7
\displaystyle {3}+{7}
3
+
7
=
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