Подстановка условия
[src](-6*(-3 - y))/5 + (79*x)/10 - 7*(4*y - x)/10 - 7*(4*y - x)/10 при y = 1/2
(-6*(-3 - y))/5 + (79*x)/10 - 7*(4*y - x)/10 - 7*(4*y - x)/10
$$- - \frac{7 x}{10} + \frac{14 y}{5} + - - \frac{7 x}{10} + \frac{14 y}{5} + \frac{79 x}{10} + \frac{1}{5} \left(-1 \cdot 6 \left(- y - 3\right)\right)$$
(-6*(-3 - (1/2)))/5 + (79*x)/10 - 7*(4*(1/2) - x)/10 - 7*(4*(1/2) - x)/10
$$- \frac{14 (1/2)}{5} - \frac{7 x}{10} + - \frac{14 (1/2)}{5} - \frac{7 x}{10} + \frac{79 x}{10} + \frac{1}{5} \left(-1 \cdot 6 \left(- (1/2) - 3\right)\right)$$
(-6*(-3 - 1/2))/5 + (79*x)/10 - 7*(4/2 - x)/10 - 7*(4/2 - x)/10
$$- - \frac{7 x}{10} + \frac{7}{5} + - - \frac{7 x}{10} + \frac{7}{5} + \frac{79 x}{10} + \frac{1}{5} \left(-1 \cdot 6 \left(-3 - \frac{1}{2}\right)\right)$$
$$\frac{93 x}{10} + \frac{7}{5}$$