Odpowiedź:
[tex]5. \: \frac{3x + x}{2} = 5 \\ 3x + x = 5 \times 2 \\ 4x = 10 \\ x = \frac{10}{4} \\ x = 2 \frac{1}{2} [/tex]
[tex]6. \: \frac{6 - 4x}{2} = 8 \\ 6 - 4x = 8 \times 2 \\ 6 - 4x = 16 \\ - 4x = 16 - 6 \\ - 4x = 10 \\ x = - \frac{10}{4} \\ x = - 2 \frac{1}{2} [/tex]
