Ответы на вопрос:
2 × (3x + 4) = - 28
3x + 4 = - 14
3x = - 14 - 4
3x = - 18
x = - 6
3 × (2x + 7) = 27
2x + 7 = 9
2x = 9 - 7
2x = 2
x = 1
5x - 3x - 2 × (4x - 1) = 40
5x - 3x - 8x + 2 = 40
7 - 11x = 40
- 11x = 40 - 7
- 11x = 33
x = - 3
7 - 2x - 3 × (5x - 2) = 47
7 - 2x - 15x + 6 = 47
13 - 17x = 47
- 17x = 47 - 13
- 17x = 34
x = - 2
2 - x / 7 = 3 + x / 14
14 (2 - x) = 7 (3 + x)
28 - 14x = 21 + 7x
- 14x - 7x = 21 - 28
- 21x = - 7
x = 1/3
7 - x / 5 = 2 + x / 15
15 (7 - x) = 5 (2 + x)
105 - 15x = 10 + 5x
- 15x - 5x = 10 - 105
- 20x = - 95
x = 19/4
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