0,5х-2,8=12. 9+2х=2 0,5х=14,8|:0,5. 2х=-7|:2 х=29,6. х=-3,5 29,6+(-3,5)=26,1
0.5х - 2.8 = 12 0.5х = 14.8 х = 29.6 9+2х=2 2х = -7 х = -3.5 х1+х2= 29.6+(3.5)= 29.6-3.5 = 26.1