1) 1376 : (34-x)=86
34-x=1376 :86
34-x=16
-x=16-34
-x=-18
х=18
2) 8680 : (x+219) =16
x+219 =8680 :16
x+219 =542,5
x =542,5-219
x =323,5
3) (x-57):28=205
x-57=205*28
x-57=5740
x=5740+57
x=5797
4) (x-72)*9=927
раскроем скобки
9x-648 = 927
9x-1575 = 0
9x = 1575
x = 175
1) 1376 : (34-x)=86
34-x=1376 :86
34-x=16
-x=16-34
-x=-18
х=18
2) 8680 : (x+219) =16
x+219 =8680 :16
x+219 =542,5
x =542,5-219
x =323,5
3) (x-57):28=205
x-57=205*28
x-57=5740
x=5740+57
x=5797
4) (x-72)*9=927
раскроем скобки
9x-648 = 927
9x-1575 = 0
9x = 1575
x = 175