Odpowiedź:
a)
5 - 3x = 14
- 3x = 14 - 5 = 9
3x = - 9
x = - 9/3 = - 3
b)
6x - 7 = 3(4x + 7)
6x - 7 = 12x + 21
6x - 12x = 21 + 7
- 6x = 28
6x = - 28
x = - 28/6 = - 4 i 4/6 = - 4 i 2/3
c)
2/5 - x/2 = x + 2 | * 10
2 * 2 - 5x = 10(x + 2)
4 - 5x = 10x + 20
- 5x - 10x = 20 - 4
- 15x = 16
15x = - 16
x = - 16/15 = - 1 i 1/15
d)
(2x - 3)(x - 3) + 7x = 2x(x - 1)
2x² - 3x - 6x + 9 + 7x = 2x² - 2x
2x² - 9x + 9 = 2x² - 2x
2x² - 2x² - 9x + 2x = - 9
- 7x = - 9
7x = 9
x = 9/7 = 1 i 2/7
