\( 19-(4+10) = 19-14 = 5 \)
\( 15-10-2 = 5-2 = 3 \)
\( 15-(10+2) = 15-12 = 3 \)
\( 8+5+7 = 13+7 = 20 \)
\( 19-4-10 = 15-10 = 5 \)
\( 8+(5+7) = 8+12 = 20 \)
Ответ: 5=5, 3=3, 20=20.