Non-Elementary Integration · Easy problem

Frullani's theorem says that if $f$ is continuous, $f(0)$ exists and $f(x)\to f(\infty)$ as $x\to\infty$, then $\displaystyle\int_0^{\infty}\dfrac{f(ax)-f(bx)}{x}\,dx=\bigl(f(0)-f(\infty)\bigr)\ln\dfrac{b}{a}$ for $a,b>0$. Evaluate $\displaystyle\int_0^{\infty}\dfrac{e^{-2x}-e^{-5x}}{x}\,dx$.