Solution - Power equations

Step  1  :

 1.1     4 = 22

(4)³ = (2²)³ = 2⁶

Equation at the end of step  1  :

        26
  20 +  ——
        -8

Step  2  :

            26
 Simplify   ——
            -8

Dividing exponents :

 2.1    2⁶   divided by   2³   = 2^{(6 - 3)} = 2³

Equation at the end of step  2  :

  20 +  -8

Step  3  :

Final result :

  12