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=2a+2b+b-3a
-3a+2a+2b+b
-a+2b+b
-a+3b
psda: Marcale mejor respuesta plz
(2a + 2b) + (b - 3a) =
2a + 2b + b - 3a
(2a - 3a) + (2b + b) =
- a + 3b
Respuesta.
3b - a