Calculate the Derivative of the Function $f ( x ) = \left[ ( 8.5 x - 6 ) ^ { 6 } + ( 4.3 x + 6 ) ^ { 5 } \right] ^ { 7 }$

Essay

Calculate the derivative of the function.
​ $f ( x ) = \left[ ( 8.5 x - 6 ) ^ { 6 } + ( 4.3 x + 6 ) ^ { 5 } \right] ^ { 7 }$ ​
Please enter your answer as an expression.