⑴2X-19<7X+31
5X>-50
X>-10
⑵3Y-6(Y-7)≤4Y
3Y-6Y+42=42
Y>=6
⑶2分之3X-7<6分之1(8X-1)
3X/2-7-24
-2X-19>-24
2X>5
X>5/2