1)

14n+32=200

14n=200-32

14n=168

n=168:14

n=12

=========

2)

x+57=12*7

x+57=84

x=84-57

x=27

=======

3)

161-y=9*16

161-y=144

y=161-144

y=17

=========

4)

17+x=112:4

17+x=28

x=28-17

x=11