Odpowiedź:
b)
[tex] \frac{5x + 1}{7} = 2x + 4 \: \: || \times 7 \\ 5x + 1 = 14x + 28 \\ 5x - 14x = 28 - 1 \\ - 9x = 27 \: \: \: || \div ( - 9) \\ x = - 3[/tex]
Spr.
[tex] L = \frac{5 \times ( - 3) + 1}{7} = \frac{ - 15 + 1}{7} = \frac{ - 14}{7} = - 2\\ P= 2 \times ( - 3) + 4 = - 6 + 4 = - 2 \\ L = P[/tex]
Odp.: x = -3
