1) 3(х-2)=х+2
3х-6=х+2
3х-х=6+2
2х=8
х=4
2) 5-2(х-1)=4-х
5-2х+2=4-х
7-2х=4-х
-2х+х=4-7
-х=-3
х=3
3) (7х+1)-(9х+3)=5
7х-2-9х-3=5
-2х-4=5
-2х=5+4
-2х=9
х=-9/2=4,5
11x^2+24x−6=0
D=12^2-11×(-6)=144+66=210 D>0
х1=-12+√210/11; х2=-12-√210/11
......................х = 1; х = -4/3.