Add, using the rule for order of operations if necessary:
2
+
[
5
+
(
−
15
)
]
+
(
−
2
)
=
\displaystyle {2}+{\left[{5}+{\left(-{15}\right)}\right]}+{\left(-{2}\right)}=
2
+
[
5
+
(
−
15
)
]
+
(
−
2
)
=
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