Найдите корень уравнения номер 821:
1)-(2x+1)=1-x
2)1/2(4x-2)=-7
3)5/6x+3=1/6x
4)3(x+6)=2(x-3)
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Ответ:

1) x = - 2

2) x = - 3

3) x = - 4,5

4) x = - 24

Пошаговое объяснение:

1) - (2x + 1) = 1 - x

- 2x - 1 = 1 - x

- 2x + x = 1 + 1

- x = 2

x = - 2

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

2x - 1 = - 7

2x = - 7 + 1

2x = - 6

x = - 3

3) 5/6x + 3 = 1/6x

5/6x - 1/6x = - 3

4/6x = - 3

x = - 9/2

x = - 4,5

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

3x + 18 = 2x - 6

3x - 2x = - 6 - 18

x = - 24