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-7a+4b-6c
""""""""""""""
0a+0b-c
Rpta: -c
7a - 4b + 5c - 7a + 4b - 6c
Agrupamos los términos semejantes con la misma variable.
7a - 7a - 4b + 4b + 5c - 6c
+ 5c - 6c
- c