А) 8х + 4 = 3х + 4; В) 1,6(а - 4) - 6,6 = 3(0,4а - 7);
6) 50(x + 3) = 250(x + 1);
г) (12-x) - (3х + 4) =-x - 1
д) 5+ (6х-2) = -(6х+11)
е) 1/15 * (х-5) =1/3
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Пошаговое объяснение:

а) 8х + 4 = 3х + 4;

8x - 3x = 4 - 4

5x = 0

x = 0

В) 1,6(а - 4) - 6,6 = 3(0,4а - 7)

1,6a - 6,4 - 6,6 = 1,2a - 21

1,6a - 13 = 1,2a - 21

1,6a - 1,2a = -21 + 13

0,4a = -8

a = -8 : 0,4

a = -20

6) 50(x + 3) = 250(x + 1);

50x + 150 = 250x + 250

250x - 50x = 150 - 250

200x = -100

x = -100 : 200

x = -0,5

г) (12-x) - (3х + 4) =-x - 1

12 - x - 3x - 4 = -x - 1

8 - 4x = -x - 1

4x - x = 8+1

3x = 9

x = 9:3

x = 3

д) 5+ (6х-2) = -(6х+11)

5 + 6x - 2 = -6x - 11

3 + 6x = - 6x - 11

6x + 6x = -11 - 3

12x = -14

x = -14:12

x = -1 1/6

е) 1/15 * (х-5) =1/3

x - 5 = 1/3 * 15/1

x - 5 = 5

x = 5+5

x = 10

​

Пошаговое объяснение:

1)0

2)20

3)0,5

4)3

5)1 1/6

6)10