а)-4.5х+1.8=-7х+2.1
-4.5х+7х=2.1-1.8
2.5х=0.3
х=0.12
б)0,4х-3.6-0.3х-0.6=0.7
0.4х-0.3х=0.7+3.6+0.6
0.1х=4.9
х=49
а)-4.5х+1.8=-7х+2.1
-4.5х+7х=2.1-1.8
2.5х=0.3
х=0.12
б)0,4х-3.6-0.3х-0.6=0.7
0.4х-0.3х=0.7+3.6+0.6
0.1х=4.9
х=49