1)2(2-y)=y-5

2)2a-(14-3a)=-10

3)1/2(4x-2)=-7

4)3(x+6)=2(x-3)

Ответ:

1) y = 3;

2) a = 0,8;

3) x = -3;

4) x = -24

Пошаговое объяснение:

1) 2(2 - y) = y - 5

4 - 2y = y - 5

4 + 5 = y + 2y

9 = 3y

3y = 9

y = 9/3

y = 3;

2) 2a - (14 - 3a) = -10

2a - 14 + 3a = -10

5a - 14 = -10

5a = -10 + 14

5a = 4

a = 4/5 = 0,8;

3) 1/2(4x - 2) = -7

(4x-2)/2 = -7/1

Решаем с помощью пропорции

4x - 2 = 2 * (-7)

4x - 2 = -14

4x = -14 + 2

4x = -12

x = -12/4

x = -3;

4) 3(x + 6) = 2(x - 3)

3x + 18 = 2x - 6

3x - 2x = -6 - 18

x = -24