A)5x-4-7 б)6x-3x+1-8 в)8-3/5x-17
5x-4=7 5x=7+4 5x=11 x11/5 x=2.2 6x-3x+1=8 3x=8-1 x=7/3 x=2.3 8-3/5x=17 -3/5x=17-8 -3/5x=9 X=9/1*(-5/3) X=-15.