Odpowiedź:
[tex]1. \: 5x - 7 = 0 \\ 5x = 0 + 7 \\ 5x = 7 \\ x = \frac{7}{5} = 1 \frac{2}{5} [/tex]
[tex]2. \: 4x - 5 = 2x + 8 \\ 4x - 2x = 8 + 5 \\ 2x = 13 \\ x = 13 \div 2 \\ x = 6.5[/tex]
[tex]3. \: 7x + 8 = 2x + 8 \\ 7x - 2x = 8 - 8 \\ 5x = 0 \\ równanie \: sprzeczne \\ [/tex]
[tex]4. \: 2 + 4x - 6 - 9x = 7 + 4x - 1 + 3x \\ - 4 - 5x = 6 + 7x \\ - 5x - 7x = 6 + 4 \\ - 12x = 10 \\ x = - \frac{10}{12} = - \frac{5}{6} [/tex]
[tex]5. \: 11x - 5 - 23x - 1 = 2x - 7 + 8x + 16 \\ - 12x - 6 = 10x + 9 \\ - 12x - 10x = 9 + 6 \\ - 22x = 15 \\ x = - \frac{15}{22} [/tex]
