Given the LPP:

Minimize $f = 2x_1 - x_2$

$x_1 \ge 0,\ x_2 \ge 0$

$x_1 + x_2 \ge 5$

$-x_1 + x_2 \le 1$

$5x_1 + 4x_2 \le 40$

The solution is

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