Question: Passing a vector element to solve function

I have a vector variable containing 5 elements of the form below:

A:=Vector(1, {(1) = 10*tau*(0.187021503664930e-5+0.5061519259e-10*Q[1])});

I want to pass the first elemet in the vector to the solve() function to compute Q[1]. I used the syntax below but got an error message "invalid input...."

solve(A[1], Q[1]);

Please how can I accomplish this?

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