Question

VA ROG E URGENT! DAU COROANA​

Answer 1

Răspuns:

$\frac{2x - 3}{7} - \frac{x - 2}{21} - \frac{x + 1}{28} = \frac{17}{28} - \frac{3x + 2}{14} \\ \frac{3 \times (2x - 3)}{21} - \frac{x - 2}{21} - \frac{x + 1}{28} = \frac{17}{28} - \frac{2 \times (3x + 2)}{28} \\ \frac{6x - 9 - x + 2}{21} - \frac{x + 1}{28} = \frac{17}{28} - \frac{6x + 4}{28} \\ \frac{5x - 7}{21} - \frac{x + 1}{28} = \frac{17 - 6x - 4 }{28} \\ \frac{4 \times (5x - 7)}{84} - \frac{3 \times (x + 1)}{84} = \frac{13 - 6x}{28} \\ \frac{20x - 28}{84} - \frac{3x + 3}{84} = \frac{3 \times (13 - 6x)}{84} \\ \frac{20x - 28 - 3x - 3}{84} = \frac{39 - 18x}{84} \\ 17x - 31 = 39 - 18x \\ 35x = 70 \\ x = 2$