Odpowiedź:
x + 9 = 2(x + 3)
x + 9 = 2x + 6
x - 2x = 6 - 9
-x = -3 /: (-1)
x = 3
Spr.: L = x + 9 = 3 + 9 = 12
P = 2(x + 3) = 2 • (3 + 3) = 2 • 6 = 12
L = P
Pozdrawiam.
Odpowiedź:
[tex]x + 9 = 2(x + 3)[/tex]
[tex]x - 9 = 2x + 6 | - x[/tex]
[tex]9 = x + 6 | - 6[/tex]
[tex]3 = x[/tex]
