1) 3,557+х/2=4 | х2
3,557+х=8
х=8-3,557
х=4,443
2) х-0,731/3=5 | х3
х-0,731=15
х=15-0,731
х=14,269
3) 12392+х=2,365+2,635
х= 2,365+2,635-12395
х= -12387
4) 125,95-х/2,65+4,35=6
125,95-х/7=6 | х7
125,95-х=42
-х=42-125,95
-х= -83,95
х= -83,95: (-1)
х= 83,95