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