Question

Помогите пж пж пж прошу ​

Answer 1

1.

$- 0.2(4b - 9) + 1.4b = 0.6b + 1.8 \\ - 0.8b + 1.8 + 1.4b = 0.6b + 1.8 \\ 0.6b + 1.8 = 0.6b + 1.8$

2.

$(5a - 3b) - (4 + 5a - 3b) = - 4 \\ 5a - 3b - 4 - 5a + 3b = - 4 \\ - 4 = - 4$