bug in function solve



Hello

Seems very strange :

f(t):=-(%e^2*t-5*%e^2)*%e^(-t/10);
f(t):=(-(%e^2*t-5*%e^2))*%e^((-t)/10)

solve(f(t)=0,t);
(%o2) [t=5,%e^(-(t-20)/10)=0]

Best regards