0.4x=0.4+0.15(x-1.2)
0.4x-0.4-(0.15x-0.18)=0
0.4x-0.4-0.15x+0.18=0
0.25x-0.4+0.18=0
0.25x-0.22=0
x=0.22/0.25
х=0.88
0.4x=0.4+0.15(x-1.2)
0.4x-0.4-(0.15x-0.18)=0
0.4x-0.4-0.15x+0.18=0
0.25x-0.4+0.18=0
0.25x-0.22=0
x=0.22/0.25
х=0.88