Question

x - 1/2 ( x + 3/2) = 2/5 (1-x/2)
(Obs: tem que dar 23/14)

Answer 1

$x - \frac{1}{2} x - \frac{3}{4} = \frac{2}{5} - \frac{2x}{ 10} \\ \\ \frac{2 - 1}{2} x + \frac{2x}{10} = \frac{2}{5} + \frac{3}{4} \\ \\ \frac{x}{2} + \frac{x}{5} = \frac{2}{5} + \frac{3}{4} \\ \\ \frac{5x + 2x}{10} = \frac{8 + 15}{20} \\ \\ \frac{7x}{10} = \frac{23}{20} \\ \\ 7x = \frac{23}{2} \\ \\ x = \frac{23}{14}$