a,`7,2-x:6,5=5,7`
`x:6,5=1,5`
`x=9,75`
`232,8-x=2,56xx4,5`
`232,8-x=11,52`
`x=221,28`
`x-93,1=72,81:18`
`x-93,1=4,045`
`x=97,145`
b, `8,6-8,33:3,4=8,6-2,45=6,15`
`9,52:6,8+3,86=1,4+3,86=5,26`
`(25,46-56,42:4)+16,5xx23=(25,46-14,105)+379,5=11,355+379,5=390,855`