1) 21(18+х)=714 2) 16(4х-34)=608 3) 12(152+19х)=2052 4) (152х+32)*6=192

1) 21(18+х)=714
18+x=714:21
18+x=34
x=34-18
x=16

2) 16(4х-34)=608
4x-34=608:16
4x-34=38
4x=38+34
4x=72
x=72:4
x=9

3) 12(152+19х)=2052
152+19x=2052:12
152+19x=171
19x=171-152
19x=19
x=19:19
x=1

4) (152х+32)*6=192
152x+32=192:6
152x+32=32
152x=32-32
152x=0
x=0