Completely simplify the expression below.
(
3
−
(
−
18
)
)
−
(
−
1
−
17
)
=
\displaystyle {\left({3}-{\left(-{18}\right)}\right)}-{\left(-{1}-{17}\right)}=
(
3
−
(
−
18
)
)
−
(
−
1
−
17
)
=
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