Уравнения 5x-4+2x=7(x-3) 7-0.2x-(21.28-1.6)=0 1/2x-3-(2-1/3x)=0 6/5-0.5x-0.4+2/5x=0

1) 5х-4+2х=7(х-3)      5х-4+2х=7х-3       5х+2х-7х=-3+4       х=1 2) 7-0.2x-(21.28-1.6)=0      7-0.2x-21.28+1.6=0       -0.2х=-1.6+21.28-7        -0.2х = 12.68         х= 12.68 : (- 0.2)         х=-63.4 3)1/2x-3-(2-1/3x)=0      1/2х-3-2+1/3х=0      1/2х+1/3=3+2       5/6х=5        х=5: 5/6         х=6 4)6/5-0.5x-0.4+2/5x=0      -0.5х+2.5х=-6/5+0.4         2х=-0.8       х=-0.8 : 2 х= -0.4