Verified answer

Ответ:

1)

[tex] \frac{x + 3}{2} - \frac{5 + x}{5} = x + 4 \\ 5(x + 3) - 2(5 + x) = 10x + 40 \\ 5x + 15 - 10 - 2x = 10x + 40 \\ 3x + 5 = 10x + 40 \\ - 7x = 35 \\ x = - 5[/tex]

2)

[tex]3x - 4 = 3(x - 2) \\ 3x - 4 = 3x - 6 \\ - 4 = - 6 \\ [/tex]

3)

[tex]3x - 2x + 2 = x + 2 \\ 3x - 2x = x \\ x = x[/tex]

4)

[tex]15(x + 2) - 30 = 12x \\ 15x + 30 - 30 = 12x \\ 15x = 12x \\ 15x - 12x = 0 \\ 3x = 0 \\ x = 0[/tex]