Question: complex functions

hi everybody, i have a question, i hope u can help me, i want to know how to convert a complex function to conjugate form, for example i want to convert  exp(Ix)  to exp(-Ix) when x is real. conjugate  command dosn't work for me, becuse it assume  that we dont khow x is real or not,when i use assume command befor conjugate,again it does not  solve my problem, in the other hand, evalc command dosn't work too, becuse i want to have exponential form. thanks so much

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