Răspuns :
[tex]x - 20\% \times x = 36 \\ x - \frac{20}{100} \times x = 36 | \times 100 \\ \\ 100x - 20x = 3600 \\ 80x = 3600 | \div 80 \\ x = 45[/tex]
[tex]x - 20\% \times x = 36 \\ x - \frac{20}{100} \times x = 36 | \times 100 \\ \\ 100x - 20x = 3600 \\ 80x = 3600 | \div 80 \\ x = 45[/tex]