Solve quation

I wish to solve this euqtion to find LC 90 .
I need to figure out the value of concentration which would kill 90% of toxic material.

The value of a,b,c,d is known from regression .


I need to cut down the quation to find con value.

10%=Exp^(a*con+b)+Exp^(c*con+d) which should give me

con= ?

Could any body help me solve this equation.


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