4. решите уравнение:

а) 4x + 2x = 66
б) 25x + 6x = 124
в) 30y – 5y = 600
г) 19a + 7a = 364
д) m + 7m = 96
е) 13b – b = 156

а) 4x + 2x = 66

х(4 + 2) = 66

6x = 66

x = 66 : 6

x = 11

б)25x + 6x = 124

x (25 + 6) = 124

31x = 124

x = 124 : 31

x = 4

в) 30y – 5y = 600

х(30 - 5) = 600

25х = 600

х = 600 : 25

х = 24

г) 19a + 7a = 364

а(19 + 7) = 364

26а = 364

а = 364 : 26

а = 14

д) m + 7m = 96

m(1 + 7) = 96

8m = 96

m = 96 : 8

m = 12

е) 13b – b = 156

b(13 – 1) = 156

12b = 156

b = 156 : 12

b = 13