2(2х+3)-5=<6x+7
4x+6-5<=6x+7
4x-6x<=7-1
-2x<=6 | /-2
x>=-3
1)х-2,5-8=-6,5
х=10,5-6,5
х=4
2) (9-4х):8=0,125
9-4х=0,125×8
9-4х=1
-4х=-9+1
-4х=-8
х=2
