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Definite integral basics challenge

Given:   26f(x)dx=3   ~~\displaystyle \int_2^6f(x)\,dx=3~~~ and    82f(x)dx=5~~~\displaystyle \int_8^2f(x)\,dx=5\,.
What is the value of   68f(x)dx~~\displaystyle \int_6^8f(x)\,dx\,?