Подстановка условия
[src]3*(a + 1) + 1/5 - 2*(1 - a) при a = -4
3*(a + 1) + 1/5 - 2*(1 - a)
$$- - 2 a + 2 + 3 \left(a + 1\right) + \frac{1}{5}$$
3*((-4) + 1) + 1/5 - 2*(1 - (-4))
$$- - 2 (-4) + 2 + 3 \left((-4) + 1\right) + \frac{1}{5}$$
3*(-4 + 1) + 1/5 - 2*(1 - (-4))
$$- 10 + 3 \left(-4 + 1\right) + \frac{1}{5}$$