Помогите пожалуйста решить 2 уравнения

a) |2x - 5| = 3
$\left \{ {{2x - 5 \geq 0} \atop {2x - 5 = 3}} \right.$
$\left \{ {{2x - 5 < 0} \atop {-2x + 5 = 3}} \right.$

$\left \{ {{x \geq 2.5} \atop {x = 4}} \right.$
$\left \{ {{x < 2.5} \atop {x = 1}} \right.$
Ответ: x = 1, x = 4

b) sqrt(4/(5x - 3)) = 0.4
5x - 3 ≥ 0, x ≥ 3/5
4/(5x - 3) = 0.16
5x - 3 = 4/0.16 = 25
x = 28/5 = 5.6