d)
[tex]2x + 9 = 1[/tex]
[tex]2x = 1 - 9[/tex]
[tex]2x = - 8[/tex]
[tex]x = - 8 \div 2 = - 4[/tex]
e)
[tex]7x - 9 = 5[/tex]
[tex]7x = 5 + 9[/tex]
[tex]7x = 14[/tex]
[tex]x = 14 \div 7 = 2[/tex]
f)
[tex]8x + 5 = - 7[/tex]
[tex]8 x = - 7 - 5[/tex]
[tex]8x = - 12[/tex]
[tex]x = - 12 \div 8 = - \frac{12}{8} = - 1 \frac{4}{8} = - 1 \frac{1}{2} [/tex]
