Zad. 2.
a) 4x - 7 = 2x + 9
2x = 16
x = 8
b) 3 - 8x = 18 - 3x
-5x = 15
x = -3
c) 2 - x = 12 + 7x
-8x = 10
[tex]x = -1\frac{2}{8} = -1\frac{1}{4}[/tex]
d) 3x + 5x - 6 = 6x + 2
2x = 8
x = 4
e) 5 - 9x + 6 = 2x + 14 - x
-10x = 3
x = -0,3
Zad. 3.
a) x (3x + 2) = 3 (x² - 4)
3x² + 2x = 3x² - 12
2x = -12
x = -6
b) 6 (1 + 2x²) = 4x (1 + 3x)
6 + 12x² = 4x + 12x²
4x = 6
[tex]x = \frac{2}{3}[/tex]
c) 3x (x - 5) = (3x + 2)(x - 1)
3x² - 15x = 3x² - 3x + 2x - 2
-14x = -2
[tex]x = \frac{1}{7}[/tex]
