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2,5x=31-6
2,5x=25
x=25/2,5
x=10
2 . 5x + 6 = 31 (si el . significa por tenemos)
10x + 6 = 31
10x = 31 - 6
10x = 25
x = 25/10 Simplificas sacas quinta
x = 5/2
Respuesta.
x = 5/2