How do you define a variable and write an expression for each phrase: 6 times a number increased by 3?
Without a comma it is difficult to know what is meant.
People often ask if punctuation is important. The importance of clearly written phrases cannot be stressed enough!
The use of a comma helps to indicate exactly what is meant.
There is no comma shown, so what is intended is not totally clear.
This expression can be read in two ways:
Note the position of the comma in each case.
Let the number be
"Times" means multiply and "increased by 3" means 3 is added.