6 + 4[5 - 3(7 + 2) - 6] =
\(6 + 4[5 - 3(7 + 2) - 6] = 6 + 4[5 - 3 \cdot 9 - 6] = 6 + 4[5 - 27 - 6] = \\\\=6+4\cdot (-28) =6-112=-106\)
6+4[5-3(7+2)-6]6+4[5-3(8)-6]6+4[2(8)-6]6+4[16-6] 6+4[14]10[14]140