12х-2.4=-12х+2.4
12х+12х=2.4+2.4
24Х=4.8
Х=0.2
9/4*Х+ 5/12=4/3*х-1/9
9/4*Х-4/3*х=-1/9- 5/12
27+16/12*x=-4-15/12
(27+16)*x=-19
43x=-19
x=-43/19
-0.8*(4х-2)=3(1.2х+2.8)
-3.2х+1.6=3.6х+8.4
-3.2х-3.6х=8.4-1.6
-6.8х=6.8
х=-1
4(х-1)=12(2х+3)
х-1=6х+9
-5х=10
х=-2
2х-12=9(х+1)
2х-9х=9+12
-7х=21
х=-3