Решите эти примеры пж полностью

Ответ:

Пошаговое объяснение:

1)

15x + 5 - 3x = 12x - 4 + 9

12x + 5 = 12x + 5

12x - 12x = 5 - 5

0 = 0

x є (-∞ ; ∞)

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2)

2x - 4x - 28 = 6 - 3x

-2x - 28 = 6 - 3x

3x - 2x = 6 + 28

x = 34

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3)

5 - 6 - 8x = 8 - 2x - 6x

-1 - 8x = 8 - 8x

-8x + 8x = 8 + 1

0 ≠ 9

уравнение не имеет корней

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4)

4x - 20 + 10x + 5 = 15 - 6x + 4

14x - 15 = 19 - 6x

14x + 6x = 19+15

20x = 34

x = 34:20

x = 1,7

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5)

8 - 20 - 15x + 22x = 7x - 28 + 16

-12 + 7x = 7x - 12

7x - 7x = 12 - 12

0 = 0

x є (-∞ ; ∞)

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6)

-4 + x - 4x + 20 = 5 - 5x

16 - 3x = 5 - 5x

5x - 3x = 5 - 16

2x = -11

x = -11:2

x = -5,5

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7)

13 - 3x - 3 = 4 - 5x

10 - 3x = 4 - 5x

5x - 3x = 4 - 10

2x = -

x = -6:2

x = -3