622. Решите уравнение: a) 8y - 3 - (5 - 2y) = 4,3; б) 0,5у - 1 - (2y + 4) = y;

Решим уравнения:

1. a) $$8y - 3 - (5 - 2y) = 4.3$$

   $$8y - 3 - 5 + 2y = 4.3$$

   $$10y - 8 = 4.3$$

   $$10y = 4.3 + 8$$

   $$10y = 12.3$$

   $$y = \frac{12.3}{10}$$

   $$y = 1.23$$

   Ответ: $$y=1.23$$

2. б) $$0.5y - 1 - (2y + 4) = y$$

   $$0.5y - 1 - 2y - 4 = y$$

   $$-1.5y - 5 = y$$

   $$-1.5y - y = 5$$

   $$-2.5y = 5$$

   $$y = \frac{5}{-2.5}$$

   $$y = -2$$

   Ответ: $$y=-2$$