Question

решите уравнение:
$\frac{1}{3} x + 7 = - 2x$
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Answer 1

$\frac{1}{3} x + 7 = - 2x \\ x = 21 - 6x \\ x + 6x = 21 \\ 7x = - 21 \\ x = - 21 \div 7 \\ x = - 3$

Ответ : —3