Respuesta :

Answer:

 3 • (40n - 9m)

Step-by-step explanation:

Equation at the end of step 1

 (84n - 12m) +  3 • (12n - 5m)

Pulling out like terms

3.1     Pull out like factors :

  120n - 27m  =   3 • (40n - 9m)

 3 • (40n - 9m)

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