Respuesta:
-12a + 17a = 5a
-3a + 12a = 9a
5ab - 7ab = -2ab
9ab - 3ab = 6ab
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Respuesta:
-12a + 17a = 5a
-3a + 12a = 9a
5ab - 7ab = -2ab
9ab - 3ab = 6ab