Suppose you want to subtract:
8
−
15
\displaystyle {8}-{15}
8
−
15
.
Re-write this subtraction as an ADDITION of signed numbers.
8
−
15
\displaystyle {8}-{15}
8
−
15
=
Now actually compute
8
−
15
\displaystyle {8}-{15}
8
−
15
=
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