Odpowiedź:
[tex] \frac{2}{5}(10 - x) = - 2 \\ 10 - x = - 5 \\ - x = - 15 \\ x = 15[/tex]
[tex]Zadanie\\\\\frac{2}{5}(10-x)=-2\ \ \ \mid\cdot 5\\\\2(10-x)=-10\\\\20-2x=-10\ \ \ \mid-20 \\\\ -2x=-30\ \ \ \mid:(-2)\\\\x=15[/tex]
