Question: darivative of a funtion

hello

when i weite this expression

diff(1/(6*t+1)+x(12*t+1)/(6*t+1)^2, t)

then it give an ans

-6/(6*t+1)^2+12*(D(x))(12*t+1)/(6*t+1)^2-12*x(12*t+1)/(6*t+1)^3

i want to solve it completly,but it give another darivative D(x) which is inside of the the equation.

how can i solve this D(x)

thanks

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