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4(z - 5) = - 8(z + 6)
4z - 20 = - 8z - 48
4z + 8z = - 48 + 20
12z = - 28
z = - 28/12 Simplificas sacas 4ta
z = (- 28/4)/(12/4)
z = - 7/3
Respuesta.
z = - 7/3
4z-20=-8z-48
4z+8z=-48+20
12z=-28
z=-28/12
z=-2,33