Final answer to the problem
$31$
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1
Apply the formula: $ab$$=ab$, where $ab=- -12$, $a=-1$ and $b=-12$
$19+12$
2
Apply the formula: $a+b$$=a+b$, where $a=19$, $b=12$ and $a+b=19+12$
$31$
Final answer to the problem
$31$
