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8-4s=1s+13
8-13=5s
-5=5s
s=-5/5
s=-1
saludos
8 - 4s = 1s + 13
8 - 13 = 1s + 4s
- 5 = 5s
- 5/5 = s
- 1 = s
Respuesta.
s = - 1