[texhax] some math command didn't working properly

[TEDY]

Dear friends,
when I use marvosym package, why some math command didn't working properly
like this :

\Longrightarrow produce =:
\Rightarrow produce :

This problem vanish when I didn't use marvosym package. What must I do if
want work with marvosym package and I want to produce that math commands?

-- 

thanks,

Tedy
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