Question: how to solve this integral?

restart:

 

inte_eq := int(-(sum(B[i]*beta[i]* exp(-beta[i] * (t-tau)),i=1..n)),tau=0..t);

int(-(sum(B[i]*beta[i]*exp(-beta[i]*(t-tau)), i = 1 .. n)), tau = 0 .. t)

(1)

how to solve this ?

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