Respuesta :

nobillionaireNobley
-4x - 9x = -13x
-4x + 9x = 5x
4x - 9x = -5x
4x - (-9x) = 4x + 9x = 13x
i.e. the second option is the answer

Answer:

-4x + 9x is your answer

hope this helps :)

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