Ответ:4x+2x=66

6x=66

x=66/6

x=11

25x+6x=124

31x=124

x=124/31

x=4

30y-5y=600

25y=600

y=600/25

y=24

19a+7a=364

26a=364

a=364/26

a=14

m+7m=96

8m=96

m=96/8

m=12

13b-b=156

12b=156

b=156/12

b=13