If $x$ and $y$ are negative rational numbers, then so is $x+y$.
True.
For example, Let $x=-1 / 3$ and $y=-2 / 3$
Then,
$=x+y$
$=(-1 / 3)+(-2 / 3)$
$=-1 / 3-2 / 3$
$=-3 / 3$
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