[tex]a*b=-\frac{25}{18}\\
a*c=-\frac{17}{24}\\
Le\ scadem:\\
a*b-a*c=-\frac{25}{18}+\frac{17}{24}\\
a(b-c)=\frac{-100+51}{72}\\
a*\frac{-21}{16}=\frac{-49}{72}|*8\\
a*(-\frac{21}{2})=-\frac{49}{9}|*18\\
a*(-189)=-98|(-1)\\
189a=98\\
a=\frac{98}{189}=\frac{14}{27}[/tex]
