All my steps are perfect and correct until the final integration of the last line... Can someone run through the propper steps of the last integration of e^-(t/3)dt from 2 to inf.

i keep getting -3+3e^-2/3 (just for the last part and it doesnt add up with the first part of the equation...

i keep getting -3+3e^-2/3 (just for the last part and it doesnt add up with the first part of the equation...

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