5v-9<7v-7 and 5 + 4v >5v-12
5v - 9 < 7v - 7 and 5 + 4v > 5v - 125v - 7v < -7 + 9 and 4v - 5v > -12 - 5-2v < 2 and -v > -17v > 2/-2 and v < -17/-1v > -1 and v < 17-1 < v < 17