Integral of the product of the two functions (convolution)

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I don't understand the result of this integral (in yellow). Could you help me please ?

enter image description here Thank you !

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Just split it into two terms. For the first term note that $be^{-by}$ is the derivative of $-e^{-by}$. For the second term note that $e^{-by}e^{-b(x-y)}=e^{-bx}$.