X+3,2=16,7 7x-3=2x-7 9x+7=4(8-x)+14 -5(0,1x-3,6)+0,1(28-x)=1,6

-х+3.2=16.7
-х=16.7-3.2=13.5
х=-13.5

7х-3=2х-7
7х-2х=-7+3
5х=-4
х=-4/5

9х+7=4(8-х)+14
9х+7=32-4х+14
9х+4х=32+14-7
13х=39
х=39/13=3

-5(0.1х-3.6)+0.1(28-х)=1.6
-0.5х+18+2.8-0.1х=1.6
-0.6х=1.6-20.8=-19.2
х=-19.2/(-0.6)=32

пользуйтесь!