Explicație pas cu pas:
[tex] \frac{5}{7} (x + 15) = \frac{11}{10}-39 \\ \frac{5(x + 15)}{7} = \frac{11 - 39 \times 10}{10} \\ 50(x + 15) = 7(11 - 390) \\ 50x + 750 = -7 \times 379) \\ 50x = - 2653 - 750 \\ 50x = - 3403 \\ x = - 3403 \div 50=>x = - 68.06[/tex]
verificare:
-68,06 + 15 = -53,06
-53,06×5/7 = -37,09
-37,09 + 39 = 1,1
1,1 = 11/10
