`14 xx 3 + 23 xx 4`
`=42 + 92`
`= 134`
----------------------------
`23 xx 5 - 96 : 4`
`=115 -24`
`= 91`
-----------------------------
`16 xx 3 + 55 : 5`
`= 48 + 11`
`= 59`
---------------------------------
`968 : 8 - 13 xx 7`
`=121 - 91`
`=30`
----------------------------------
`69 : 3 + 21 xx 4`
`= 23 + 84`
`= 107`
-----------------------------------
`36 xx 3 - 29 xx 2`
`= 108 - 58`
`=50`
----------------------------------------
`72 : ( 107 - 99)`
`= 72 : 8`
`=9`
------------------------------------------
`5 xx ( 145 - 123)`
`= 5 xx 22`
`= 110`