Răspuns:
[tex]\displaystyle (\ - \ \frac{4}{5} \ + \ \frac{1}{10} ) \ \cdot \ x \ + \ 1 \ = \ 3 \\ \\\displaystyle (\ - \ \frac{8}{10} \ + \ \frac{1}{10} ) \ \cdot \ x \ + \ 1 \ = \ 3 \\\\\\ - \ \frac{7}{10} \cdot \ x \ + \ 1 \ = \ 3 \\\\\displaystyle - \ \frac{7}{10} \cdot \ x \ = \ 3 \ - \ 1 \\\\\ - \ \frac{7}{10} \cdot \ x \ = \ 2 \\\\\displaystyle x \ = \ 2 \ : \ ( - \frac{7}{10} ) \\\\\displaystyle x = \ 2 \ \cdot ( - \frac{10}{7} ) \\ \\\displaystyle x =- \frac{20}{7}[/tex]
