Suppose you want to subtract:
12
−
(
−
6
)
\displaystyle {12}-{\left(-{6}\right)}
12
−
(
−
6
)
.
Re-write this subtraction as an ADDITION of signed numbers.
12
−
(
−
6
)
\displaystyle {12}-{\left(-{6}\right)}
12
−
(
−
6
)
=
Now actually compute
12
−
(
−
6
)
\displaystyle {12}-{\left(-{6}\right)}
12
−
(
−
6
)
=
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