root of $a-b{{e}^{cx}}-{{e}^{\left( c+d \right)x}}=0$

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I am trying to find the root(s) of this equation, basically write variable x in terms of parameters a, b, c, and d. not sure how to proceed. Thanks!

$$a-b{{e}^{cx}}-{{e}^{\left( c+d \right)x}}=0$$