Odpowiedź:
[tex]5x-6+2x-1=14\\\\5x+2x=14+6+1\\\\7x=21 \ \ |:7\\\\\huge\boxed{x=3}[/tex]
5x - 6 + 2x - 1 = 14
7x - 7 = 14
7x = 14 + 7
7x = 21 /: 7
x = 3
Sprawdzenie:
5 • 3 - 6 + 2 • 3 - 1 = 14
15 - 6 + 6 - 1 = 14
15 - 1 = 14
14 = 14
L = P
