[tex]7200 \div x = 800 \\ x \times 700 = 42000 \\ 60 \times x = 5400[/tex]

7200 : x = 800x = 7200 : 800x = 9x • 700 = 42000x = 42000 : 700x = 6060 • x = 5400x = 5400 : 60 x = 90