А) 0.8(9+2х)= 1 целая одна вторая х
7.2+1.6х=1.5х
1.5х-1.6х=7.2
-0.1х=7.2
х=7.2: -0.1
х=-72
Б)х-4.5 -2х-3.5
=
2 3
3(х-4.5)=2(-2х-3.5)
3х-13.5=-4х-7
3х+4х=-7+13.5
7х=6.5
х=65
__
70
