\(B=\dfrac{6^6+6^3.3^3+3^6}{-73}\)
\(B=\dfrac{46656+5832+729}{-73}\)
\(B=\dfrac{52488+729}{-73}\)
\(B=\dfrac{53217}{-73}=-729\)
\(\dfrac{6^6+6^3\cdot3^3+3^6}{-7^3}\)
\(=\dfrac{46656+46656\cdot27+729}{-343}\)
\(=\dfrac{46656+1259712+729}{-343}\)
\(=\dfrac{1306368+729}{-343}\)
\(=\dfrac{1307097}{-343}\)