c) \(107-\left\{38+\left[7\cdot3^2-24:6+\left(9-7\right)^3\right]\right\}:15\)
\(=107-\left\{38+\left[7\cdot9-4+\left(2\right)^3\right]\right\}:15\)
\(=107-\left[38+\left(63-4+8\right)\right]:15\)
\(=107-\left(38+67\right):15\)
\(=107-105:15\)
\(=107-7\)
\(=100\)