a)
[tex]2(x + 4) - 1 = 5x + 2 \\ 2x + 8 - 1 = 5x + 2 \\ x + 7 = 5x + 2 \\ - 4x = - 5 \\ x = \frac{5}{4} [/tex]
b)
[tex]4 + 2(x + 1) = 6x + 2 \\ 4 + 2x + 2 = 6x + 2 \\ 2x - 6x = - 4 \\ - 4x = - 4 \\ x = 1[/tex]
c)
[tex] \frac{15 + ( -1 2)}{6} = 2x | \times 6 \\ 15 - 12 = 2x \\ 3 = 2x \\ x = \frac{3}{2} [/tex]
d)
[tex]9x + 12 = 12 x+ ( - 9) \\ 9x + 12 = 12x - 9 \\ 9x - 12x = - 9 - 12 \\ - 3x = - 21 \\ x = 7[/tex]
