\( 7 + 7 = 14 \)
\( 7 + 7 + 7 = 21 \)
\( 14 < 21 \)
\( 9 + 9 + 9 = 27 \)
\( 9 + 9 = 18 \)
\( 27 > 18 \)
Ответ: 7+7 < 7+7+7, 9+9+9 > 9+9.