1.
85:x=17
x=85:17
x=5
2.
B*27=459
B=459:27
B=17
3.
(x+74)-91=35
x+74-91=35
x-17=35
x=35+17
x =52
4.
54-(Х-19)=38
73-x=38
-x=38-73
-x=-35
x=35
5.
Х-479=164
x=479+164
x=634
6.
62-(х-23)=34
85-x=34
-x=34-85
-x=-51
x=51
7.
(х+83)-92=45
x+83-92=45
x -9=45
x=45+9
x=54
8.
Х*43=2451
43x=2451
x=2451:43
x=57