Подстановка условия
[src]a + 33/10 - a - 33/10 - x при a = 1/3
a + 33/10 - a - 33/10 - x
$$- x + - a + a + \frac{33}{10} - \frac{33}{10}$$
(1/3) + 33/10 - (1/3) - 33/10 - x
$$- x + - (1/3) + (1/3) + \frac{33}{10} - \frac{33}{10}$$
1/3 + 33/10 - 1/3 - 33/10 - x
$$- x + - \frac{33}{10} + - \frac{1}{3} + \frac{1}{3} + \frac{33}{10}$$