0.6х+4.2=0.5х-1.5+6.8
0.6х+4.2=0.5х+5.3
0.6х-0.5х=5.3-4.2
0.1х=1.1
х=1.1:0.1
х=11
0.6x+4.2=0.5x-1.5+6.8
0.6x-0.5x=-4.2-1.5+6.8
0.1x=-5.7+6.8
0.1x=1.1
x=1.1/0.1
x=11
0.6х+4.2=0.5х-1.5+6.8
0.6х+4.2=0.5х+5.3
0.6х-0.5х=5.3-4.2
0.1х=1.1
х=1.1:0.1
х=11
0.6x+4.2=0.5x-1.5+6.8
0.6x-0.5x=-4.2-1.5+6.8
0.1x=-5.7+6.8
0.1x=1.1
x=1.1/0.1
x=11