[Avodah] Mitzvot and sins cancel each other, or not

[Moshe Y. Gluck]

MYG:
> >  While I'm sure that the author of the poem was L'sheim Shamayim,
> IMHO, the
> >  poem contradicts some fundamentals of Yiddishkeit, such as "Ein HKBH
> >  M'kapeiach S'char Kol Beryah," and the Mesillas Yeshrim that Mitzvos
> and
> >  Aveiros don't cancel each other out.

R' MM:
> But who says that Mesilat Yesharim is the only opinion here? The
> Gemara says that tzedaka, for example, cancels out averot.
<SNIP>

I was basing myself mainly on the Gemara, and brought the MY L'ravcha
D'milsa. In any case, can you provide a source that Tzedakah cancels out
Aveiros?

KT,
MYG