Odpowiedź:
[tex]a) \: 5x + 5 = x - 4 \\ 4x = - 9 \\ x = - \frac{9}{4} \\ x = - 2 \frac{1}{4} [/tex]
[tex]b) \: 3x + 6 = - x - 1 + 8x \\ - 4x = - 7 \\ x = \frac{7}{4} \\ x = 1 \frac{3}{4} [/tex]
[tex]c) \: 4x - 8 = 8x - x - 1 \\ - 3x = 7 \\ x = - \frac{7}{3 } \\ x = - 2 \frac{1}{3} [/tex]
[tex]d) \: 3x - 5x - 3.9x = 2.4x - 2.4 \\ - 8.1x = - 2.4 \\ x = 0.3[/tex]