Answer 1

$3x - (10 + 5x) = 54$

$3 x - 10 - 5x = 54$

$- 2x - 10 = 54$

$- 2x = 54 + 10$

$- 2x = 64$

$x = 64 \div ( - 2)$

$x = - 32$

Проверка:

$3 \times ( - 32) - (10 + 5 \times ( - 32)) = 54$

Ответ:×=-32

Answer 2

3x-10-5x=54

-2x=54

x=-27

Answer 3

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