a)
[tex]2x + 9 = 1 | - 9 \\ 2x = - 8 | \div 2 \\ x = - 4[/tex]
b)
[tex]7x - 9 = 5 | + 9 \\ 7x = 14 | \div 7 \\ x = 2[/tex]
c)
[tex]8x + 5 = - 7 | - 5 \\ 8x = - 12 | \div 8 \\ x = - \frac{12}{8} = - 1 \frac{4}{8} = - 1 \frac{1}{2} = - 1.5[/tex]
Myślę że pomogłem ;)
