Add:1. 13 and 152. 13 and -153. 259 and 2144. -623 and 3265. -622 and -254
1. 13 and 15 = 13 $+$ 15 = 28.
2. 13 and $-$15 = $-$(15 $-$13) = $-$2.
3. 259 and 214 = 259 $+$ 214 = 473.
4. $-$623 and 326 = $-$(623 $-$ 326) = $-$(297) = $-$297.
5. $-$622 and $-$254 = $-$(622$+$ 254)= $-$(876) = $-
$876.
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