bunan 0.3x-0.6-0.2x-0.8=-2.9 | *10
3x-6-2x-8=-29
x=-29+6+8
x=-15

Umnik0super0mozg0 0.3*(x-2)-0.2*(x+4)=-2.9
0.3х-0.6-0.2х-0.8=-2.9
0.3х-0.2х=-2.9+0.8+0.6
0.1х=-1.5
х=-1.5:0.1
х=-15
_____________
0.3*(-15-2)-0.2*(-15+4)=-2.9