Verified answer

21(18+х)=714

18+х=714:21

18+х=34

х=34-18

х=16

.

16(4х-34)=608

4х-34=608:16

4х-34=38

4х=38+34

4х=72

х=72:4

х=18

.

12(152+19х)=2052

152+19х=2052:12

152+19х=171

19х=171-152

19х=19

х=1

.

(152х+32)*6=192

152х+32=192:6

152х+32=32

152х=32-32

152х=0

х=0:152

х=0