Verified answer

Ответ:

1)

[tex]7x - 8 = 12 - 3x \\ 7x + 3x = 12 + 8 \\ 10x = 20 \\ x = 2[/tex]

2)

[tex]40 - 2x = 5x + 19 \\ - 2x - 5x = 19 - 40 \\ - 7x = - 21 \\ x = 3[/tex]

3)

[tex]10x + 5 = 33 - 4x \\ 10x + 4x = 33 - 5 \\ 14x = 28 \\ x = 2[/tex]

4)

[tex]0.3x - 2.4 = 3.2 - 0.5x \\ 0.3x + 0.5x = 3.2 + 2.4 \\ 0.8x = 5.6 \\ x = 7[/tex]

5)

[tex]3(2x - 1) + 6x = 10x - 7 \\ 6x - 3 + 6x = 10x - 7 \\ 12x - 3 = 10x - 7 \\ 12x - 10x = - 7 + 3 \\ 2x = - 4 \\ x = - 2[/tex]

6)

[tex] \frac{2}{3} x - 18 = \frac{5}{9} x - 17 \\ \frac{2}{3} x - \frac{5}{9} x = - 17 + 18 \\ \frac{6 - 5}{9} x = 1 \\ \frac{1}{9} x = 1 \\ x = 9[/tex]