Respuesta :

zarampa

Answer:

s = -1

Step-by-step explanation:

8 - 4s = s + 13

-4s - s = 13 - 8

-5s = 5

s = 5/-5

s = -1

probe:

8 - 4*-1 = -1 + 13

8 + 4 = 12

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