124. Найдите корень уравнения: 1) 13x + 4x = 408; 2) 47x-15x = 2 144; 3) a + 23a = 1032; 4) 16x - x + 14 = 299; 5) 7b +6b - 29 = 374; 6) 19y-12y-47 = 1 388.

1) 13x + 4x = 408

17x = 408

x = 408 / 17

x = 24

2) 47x - 15x = 2144

32x = 2144

x = 2144 / 32

x = 67

3) a + 23a = 1032

24a = 1032

a = 1032 / 24

a = 43

4) 16x - x + 14 = 299

15x + 14 = 299

15x = 299 - 14

15x = 285

x = 285 / 15

x = 19

5) 7b + 6b - 29 = 374

13b - 29 = 374

13b = 374 + 29

13b = 403

b = 403 / 13

b = 31

6) 19y - 12y - 47 = 1388

7y - 47 = 1388

7y = 1388 + 47

7y = 1435

y = 1435 / 7

y = 205