1.2d-0.5(4d-1)=-0.7(d-2)
1.2d-2d+0.5=-0.7d+1.4 1.2d+2d+0.7d=-0.5+1.4 3.9d=1.9 d=3.9:1.9 d= 2.1
spasibo no yche pozno
nezachto
nima bu ukam? chunmadim!