2,5х+8,47=15,22
2,5х=15,22-8,47
2,5х=6,75
х=6,75:2,5
х=2,7
проверка
2,5*2,7+8,47=15,22
6,75+8,47=15,22
15,22=15,22
233,8-8,7х=189,691
8,7х=233,8-189,691
8,7х=44,109
х=44,109:8,7
х=5,07
проверка
233,8-8,7*5,07=189,691
233,8-44,109=189,691
189,691=189,691
6,37х+20,7-4,3х=42,435
2,07х=42,435-20,7
2,07х=21,735
х=21,735:2,07
х=10,5
проверка
6,37*10,5+20,7-4,3*10,5=42,435
66,885+20,7-45,15=42,435
42,435=42,435
3,71х+16,31=63,427
3,71х=63,427-16,31
3,71х=47,117
х=47,117:3,71
х=12,7
проверка
3,71*12,7+16,31=63,427
47,117+16,31=63,427
63,427=63,427
20,3-7,2х=18,932
7,2х=20,3-18,932
7,2х=1,368
х=1,368:7,2
х=0,19
проверка
20,3-7,2*0,19=18,932
20,3-1,368=18,932
18,932=18,932