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rearranging equations

Can someone please help me rearrange this formula to find t.

0.4=1.2(1-e^(-t/2) )

$\frac{2}{5}=\frac{6}{5}\left(1-e^{\frac{-t}{2}}\right)$

Multiply both sides by 5/6.

$\frac{1}{3}=1-e^{\frac{-t}{2}}$

Subtract 1 from both sides:

$\frac{2}{3}=e^{\frac{-t}{2}}$

Now, take ln of both sides and finish up?

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