a)
[tex]7x - 6 = - 6x + 7 \\ 13x = 13 | \div 13 \\ x = 1[/tex]
b)
[tex] \frac{1}{3} x + 2 = x | \times 3 \\ x + 6 = 3x \\ - 2x = - 6 | \div ( - 2) \\ x = 3[/tex]
c)
[tex] - 7(2x + 1) = 4 \\ - 14x - 7= 4 \\ - 14x = 11 | \div ( - 14) \\ x = - \frac{11}{14} [/tex]
d)
[tex]8 = 6(x - 1) - 4x \\ 8 = 6x - 6 - 4x \\ 14 = 2x | \div 2 \\ x = 7[/tex]
