Question

2. Решите уравнения: 1) 9-7(x+3) = 5 - 4x. 3 При ко 2) |5x -15| = 60 С​

Answer 1

1.

$9 - 7(x + 3) = 5 - 4x$

$9 - 7x - 21 = 5 - 4x$

$- 12 - 7x = 5 - 4x$

$- 7x + 4x = 5 + 12$

$- 3x = 17$

$x = - \frac{17}{3}$

2.

$|5x - 15| = 60$

$5x - 15 = 60 \\ 5x - 15 = - 60$

$x = 15 \\ x = - 9$

$x_{1} = - 9$

$x_{2} = 15$