Respuesta :

5v - 9 < 7v - 7 and 5 + 4v > 5v - 12
5v - 7v < -7 + 9 and 4v - 5v > -12 - 5
-2v < 2 and -v > -17
v > 2/-2 and v < -17/-1
v > -1 and v < 17
-1 < v < 17