Question

X sobre 4 + 1 = 7 - x sobre 2

Answer 1

$\frac{x}{4 + 1} = \frac{7 - x}{2} \\ \\ \frac{x}{5} = \frac{7 - x}{2} \\ 2x = 5(7 - x) \\ 2x = 35 - 5x \\ 2x + 5x = 35 \\ 7x = 35 \\ x = \frac{35}{7} \\ x = 5$