Question

Помогите)
4z+12-7z+7=1

Answer 1

4z-7z=1-7-12

-3z=-18

z=6

Answer 2

а почему у вас получилось -18?

Answer 3

1-7=-6

Answer 4

-6-12=-18

Answer 5

4z + 12 - 7z + 7 = 1
4z - 7z + 12 + 7 = 1
- 3z + 12+ 7 = 1
- 3z + 19 = 1
- 3z = 1 - 19
- 3z = - 18
z = - 18 ÷ ( - 3 )
z = 6.

Ответ: z = 6.