Выражения : 2) -2x+3.7+2x-5 3) a-4/5a-1/7a 4) 0.2d-2/3-2d+5/9 5) y-3.2+2y-4.6-5y 6) -z+2.3x+0.11z=8.9x 7) -c+2/3b-2/7c-4/9b 8) m-0.8m-1/5m-1/2m с решениями, 15

2) -2х+3,7+2х-5= -1,3
3) а - 4/5а - 1/7а = а* ( 1-4/5-1/7) =
= а * ((35- 28-5)/35)= 2/35 *а
4) 0,2d-2/3-2d+5/9 = -1.8d -1/9
5) y-3.2+2y-4.6-5y= -2y -7.8= -2*(y+3.9)
6)-z+2.3x+0.11z+8.9x= -0.89z+11.2x
7) -c +2/3b-2/7c-4/9b= -c(1+2/7)+b(2/3-4/9)=
=- 9/7с+ 2/9b 
8) m-0.8m-1/5m-1/2m= m(1-0.8-1/5-1/2)=
= m ( 1-0.8-0.2-0.5) = -0.5m

2) -2х+3,7+2х-5= -1,3
3) а-4/5а-1/7а=5/5а-4/5а-1/7а=1/5а-1/7а=2/35 а
4) 0,2d-2/3-2d+5/9= -1.8d -1/9
5) у-3,2+2у-4,6-5у= -2у-7,8
6) -z+2.3x+0.11z+8,9х= -0,89 z+11.2x
7) -с+2/3в-2/7с-4/9в= -9/7с+2/9в
8) m-0.8m-1/5m-1/2m=1/1m-8/10m-1/5m-1/2m= -5/10m=-1/2m