Final answer to the problem
$9$
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1
Apply the formula: $ab$$=ab$, where $ab=- -5$, $a=-1$ and $b=-5$
$4+5$
2
Apply the formula: $a+b$$=a+b$, where $a=4$, $b=5$ and $a+b=4+5$
$9$
Final answer to the problem
$9$
