Aloha :)
$$I=\int\limits_0^x \left(184-184e^{-0,135\,t}\right)dt=\left[184t-\frac{184}{-0,135}e^{-0,135\,t}\right]_0^x$$$$\phantom{I}=\left(184x+\frac{184}{0,135}e^{-0,135\,x}\right)-\left(0+\frac{184}{0,135}\right)$$$$\phantom{I}=184x+\frac{36\,800}{27}e^{-0,135\,x}-\frac{36\,800}{27}$$$$\phantom{I}=184x+\frac{36\,800}{27}\left(e^{-\frac{27x}{200}}-1\right)$$