a)
[tex]7x + 5 = x + 3 | - 5 \\ 7x = x - 2 [/tex]
b)
[tex]2x - 4 = 3x - 8 | + 4 \\ 2x = 3x - 4[/tex]
c)
[tex] \frac{1}{3} x = 5 | \times 3 \\ x = 15[/tex]
d)
[tex]6x = - 2 | \div 6 \\ x = - \frac{2}{6} [/tex]
