Odpowiedź:
[tex]a) \frac{x}{5} + 8 = 20 \times 5 \\ x + 40 = 100 \\ x = 100 - 40 \\ x = 60[/tex]
[tex]b)3 + \frac{x}{3} = 4 \ \times3 \\ 9 + x = 12 \\ x = 12 - 9 \\ x = 3[/tex]
