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(2a + 2b) - (b - 3a) =
2a + 2b - (b - 3a) = Para quitar parentesis aplicas ley de signos
- por + = - y - por - = +
2a + 2b - b + 3a
(2a + 3a) + (2b - b) =
5a + b
Respuesta.
5a + b