Ответ:

1)

[tex]x = 3[/tex]

2)

[tex]12[/tex]

3)

[tex]x = 16 - 8[/tex]

[tex]x = 8[/tex]

Объяснение:

1)

[tex]2x + 3 = 9 \\ 2x = 9 - 3[/tex]

[tex]2x = 6 \\ x = 6 \div 2[/tex]

[tex]x = 3[/tex]

2)

[tex]4 \times (5 - 2) = 4 \times 3 = 12[/tex]

3)

[tex]8 + x = 16 \\ x = 16 - 8[/tex]

[tex]x = 8[/tex]

Verified answer

Объяснение:

2х + 3 = 9

2х = 9 - 3

2х = 6

х = 6 : 2

х = 3

4 * (5 - 2) = 4 * 3 = 12

8 + х = 16

х = 16 - 8

х = 8