用matlab解指数方程solve('6600*(exp^((-0.1155)*x)-exp^((-0.1386)*x))=200','x')要怎么算.

solve('6600*(exp((-0.1155)*x)-exp((-0.1386)*x))=200','x')

ans =

[ 33.242273582919781044404221544008+110.39820712376981372639082521324*i]
[ 33.242273582919781044404221544008-110.39820712376981372639082521324*i]
[ 30.417499329414390730090293198279+58.693678312326391933412403634227*i]
[ 30.417499329414390730090293198279-58.693678312326391933412403634227*i]
[ 22.435077863592306008843810565972]
[ 1.6093400115869796827381043168861]
.
solve('6600*(exp((-0.1155)*x)-exp((-0.1386)*x))-200','x')

ans =

[ 33.242273582919781044404221544008+110.39820712376981372639082521324*i]
[ 33.242273582919781044404221544008-110.39820712376981372639082521324*i]
[ 30.417499329414390730090293198279+58.693678312326391933412403634227*i]
[ 30.417499329414390730090293198279-58.693678312326391933412403634227*i]
[ 22.435077863592306008843810565972]
[ 1.6093400115869796827381043168861]咱俩写的基本一样啊。。。为什么我的出不来