Odpowiedź :
[tex]x+3x+3x-4 = 38\\\\7x = 38+4\\\\7x = 42 \ \ /:7\\\\\boxed{x = 6}[/tex]
[tex]Spr.\\L = 6+3\cdot6+3\cdot6-4 = 6+18+18}-4 = 42-4 = 38\\P = 38\\L = P[/tex]
[tex]x+3x+3x-4=38\\7x-4=38/+4\\7x=42\\x=6\\Spr.\\6+18+18-4=38\\38=38\\L=P[/tex]
[tex]x+3x+3x-4 = 38\\\\7x = 38+4\\\\7x = 42 \ \ /:7\\\\\boxed{x = 6}[/tex]
[tex]Spr.\\L = 6+3\cdot6+3\cdot6-4 = 6+18+18}-4 = 42-4 = 38\\P = 38\\L = P[/tex]
[tex]x+3x+3x-4=38\\7x-4=38/+4\\7x=42\\x=6\\Spr.\\6+18+18-4=38\\38=38\\L=P[/tex]