2x+9<3-x<6x+7 berapa hasilnya

2x + 9 < 3 – x < 6x + 7

2x + 9 < 3 – 7 -6x – x < 0

2x + 9 < -7x – 4

2x + 7x  + 4 + 9 < 0

9x + 13 < 0