1. а)
19х-(3х-4)=4(5х-1)
19х -3х +4 = 20х -4
19х-3х -20х = -4 -4
-4х = -8
4х = 8
х=2
б) 4(0,25х-6)=8(0,125х+3)
х -24 = х +24
х-х = 24+24
0 = 48
0≠ 48
2.
а) (2х+3)(4х-3)-2х(4х+1)-17=0
8х² - 6х + 12х - 9 - 8х² - 2х -17 =0
4х - 26 =0
4х =26
х = 26/4
х = 6,5