[tex]10x = x + x + 28 \\ 10x = 2x + 28 \\ 8x = 28 \\ x = 3.5[/tex]
Zatem
[tex]3x = 3 \times 3.5 = 10.5[/tex]
[tex]7x = 7 \times 3.5 = 24.5[/tex]
Czyli cały odcinek ma
[tex]10.5 + 24.5 = 35cm[/tex]
