[tex] (48 + 5 \times 2 \times 3 \div 2) \div u = 81 \div 9 \\ (48 + 30 \div 2) \div u = 9 \\ (48 + 15) \div u = 9 \\ 63 \div u = 9 \\ u = 63 \div 9 \\ u = 7[/tex]
[tex]500 - 100 \div 2 = 3900 + v \\ 500 - 50 = 3900 + v \\ 450 = 3900 + v \\ - v = 3900 - 450 \\ - v = 3450 \\ v = - 3450[/tex]
[tex]1000 \div 5 \div 4 \div 10 + (96 + w) = 11 \\ 5 + 96 + w = 11 \\ 101 + w = 11 \\ x = 11 - 101 \\ x = - 90[/tex]
