Question

alguém sabe?????????????​

Answer 1

✔OLÁ!!!

$a) \frac{2x + 3}{5x - 1} = \frac{4}{7} \\ 20x - 4 = 14x + 21 \\ 20x - 14x = 21 + 4 \\ 6x = 25 \\ x = \frac{25}{6} \\ x = 4.16$

$b) \frac{2}{3x} = \frac{3}{4x + 1} \\ 9x = 8x + 2 \\ 9x - 8x = 2 \\ x = 2$

$c) \frac{2}{4} = \frac{3}{x} \\ 2x = 12 \\ x = \frac{12}{2} \\ x = 6$

$d) \frac{4}{12} = \frac{x}{21} \\ 12x = 84 \\ x = \frac{84}{12} \\ x = 7$