and 

f(x) =    9x3 + 2x2 - 5x + 4 --------->    9x3 + 2x2 - 5x + 4

g(x) = - (5x3       - 7x + 4) -------->  - 5x3       + 7x - 4          

                                           4x3 + 2x2 + 2x ------->  

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