Solution - Simplification or other simple results

Step  1  :

 1.1     8 = 23

(8)² = (2³)² = 2⁶

Equation at the end of step  1  :

  (-8 +  (26 • -2)) +  -6

Step  2  :

Multiplying exponents :

 2.1    2⁶  multiplied by  2¹   = 2^{(6 + 1)} = 2⁷

Equation at the end of step  2  :

  (-8 +   -27) +  -6

Step  3  :

Final result :

  -142