Question

ПОМОГИТЕ Пожалуйста

Answer 1

Ответ:

$- 2.8 \times (3x + 7) = 1.4 + 4.2 \\ - 2.8 \times (3x + 7) = 5.6 \\(3x + 7) = 5.6 \div ( - 2.8) = \\ 3x + 7 = - 2 \\ 3x = - 2 - 7 \\ 3x = - 9 \\ x = - 3$

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