Question

Помогите дам 15 балов!!!​

Answer 1

Ответ:

1) - 8

2) - 20

3) 13

Объяснение:

1)

$\frac{x + 8}{3} - \frac{x - 2}{5} = 2 \\ \frac{(x + 8) \times 5 - (x - 2) \times 3}{15} = 2 \\ \frac{5x + 40 - 3x + 6}{15} = 2 \\ \frac{2x + 46}{15} = 2 \\ 2x + 46 = 2 \times 15 \\ 2x = 30 - 46 \\ 2x = - 16 \\ x = - 16 \div 2 \\ x = - 8$

2.

$\frac{x + 14}{6} - \frac{x - 12}{8} = 3 \\ \frac{(x + 14) \times 4 - (x - 12) \times 3}{24} = 3 \\ \frac{4x + 56 - 3x + 36}{24} = 3 \\ \frac{x + 92}{24} = 3 \\ x + 92 = 3 \times 24 \\ x = 72 - 92 \\ x = - 20$

3.

$\frac{7x - 4}{9} - \frac{3x + 3}{4} = \frac{8 - x}{6} \\ \frac{(7x - 4) \times 4 - (3x + 3) \times 9}{36} = \frac{8 - x}{6} \\ \frac{28x - 16 - 27x - 27}{36} = \frac{8 - x}{6} \\ \frac{x - 43}{36} = \frac{8 - x}{6} \\ (x - 43) \times 6 = (8 - x) \times 36 \\ 6x - 258 = 288 - 36x \\ 6x + 36x = 288 + 258 \\ 42x = 546 \\ x = 546 \div 42 \\ x = 13$