Given: $~~\displaystyle \int_k^{2k}f(x)\,dx=-2~~~$ and $~~~\displaystyle \int_k^{5k}f(x)\,dx=6\,$,$~~$ where $~k>0\,$.
What is the value of $~~\displaystyle \int_{2k}^{5k}f(x)\,dx\,$?
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