Question

Реши уравнение: x + 21
Ответ:
X
3
=
12.

Answer 1

$x + 21 - \frac{x}{3} = 12 \: \: | \times 3 \\ 3x + 63 - x = 36 \\ 2x = 36 - 63 \\ 2x = - 27 \\ x = - 27 \div 2 \\ x = - 13.5$