[tex] + 99 + 5 \times (10 + 10 \div (25 \times 24 - ( x \div 9))) = 139 \\ \\ 5 \times (10 + 10 \div (25 \times 24 - (x \div 9))) = 40 \\ \\ 10 + 10 \div (25 \times 24 - (x \div 9)) = 8 \\ \\ 10 \div (25 \times 24 - ( \times \div 9)) = - 2 \\ \\ 25 \times 24 - (x \div 9) = - 20 \\ \\ 24 - (x \div 9) = - 0.8 \\ \\ 24 - (x \div 9) = - \frac{8}{10} \\ \\ 24 - (x \div 9) = - \frac{4}{5} \\ \\ x \div 9 = - \frac{4}{5} - 24 \\ \\ x \div 9 = - \frac{4}{5} - \frac{120}{5} \\ \\ x \div 9 = \frac{ - 4 - 120}{5} \\ \\ x \div 9 = \frac{ - 124}{5} \\ \\ x = \frac{ - 124}{5} \times \frac{1}{9} \\ \\ x = \frac{ - 124}{45} [/tex]
