notez numarul necunoscut cu x
[tex](x - 4) \div 0.(2) - 3 = x \\( x - 4) \div \frac{2}{9} - 3 =x \\ (x - 4) \times \frac{9}{2} - 3 = x \\ \frac{9 \times (x - 4)}{2} - 3 = x \\ \frac{9x - 36}{2} - 3 = x \\ 9x - 18 - 3 = x \\ 9x - 21 = x \\ 9x - x = 21 \\ 8x = 21 \\ x = 21 \div 8 \\ x = 2.625[/tex]
