@Carl Love 

dS__c := Gamma*(P*In__a+R__a+S__a)-rho*S__c-S__c*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__h*S__c=0; dIn__c := S__c*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-rho*In__c-gamma*In__c-mu__h*In__c=0; dR__c := gamma*In__c-rho*R__c-R__c*mu__h=0; dS__a := rho*S__c-S__a*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__h*S__a=0; dIn__a := rho*In__c+S__a*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-gamma*In__a-mu__h*In__a=0; dR__a := gamma*In__a+rho*R__c-R__a*mu__h=0; dIn__m := Gamma*In__a*(1-P)-mu__m*In__m=0;dS__v := Gamma__v-S__v*beta__v*(In__c+In__a+In__m)/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__v*S__v=0; dIn__v := S__v*beta__v*(In__c+In__a+In__m)/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__v*In__v=0; solve({dIn__a, dIn__c, dIn__m, dIn__v, dR__a, dR__c, dS__a, dS__c, dS__v},{In__a,In__c,In__m,In__v,R__a,R__c,S__a,S__c,S__v}); Warning, solutions may have been lost

@Carl Love 

@Carl Love 

           
 

dS__a := Gamma*(P*In__a+R__a+S__a)-rho*S__c-S__c*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__h*S__c; dIn__c := S__c*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-rho*In__c-gamma*In__c-mu__h*In__c; dR__c := gamma*In__c-rho*R__c-R__c*mu__h; dS__a := rho*S__c-S__a*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__h*S__a; dIn__a := rho*In__c+S__a*beta__h*In__v/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-gamma*In__a-mu__h*In__a; dR__a := gamma*In__a+rho*R__c-R__a*mu__h; dIn__m := Gamma*In__a*(1-P)-mu__m*In__m;dS__v := Gamma__v-S__v*beta__v*(In__c+In__a+In__m)/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__v*S__v; dIn__v := S__v*beta__v*(In__c+In__a+In__m)/(S__c+In__c+R__c+S__a+In__a+R__a+In__m)-mu__v*In__v; solve({dIn__a=0, dIn__c=0, dIn__m=0, dIn__v=0, dR__a=0, dR__c=0, dS__a=0, dS__c=0, dS__v=0}, {In__a,In__c,In__m,In__v,R__a,R__c,S__a,S__c,S__v}); Still no answer but no error