To simplify this expression:
1. Remove the parenthesis: To remove parenthesis you need to know that the symbol outside parenthesis affects all the terms inside parenthesis.
[tex]\begin{gathered} +(-)=- \\ -(+)=- \\ -(-)=+ \\ +(+)=+ \end{gathered}[/tex]The given expression after remove the parenthesis is:
[tex]6.2n-8.3-9.1+1.4n[/tex]2. Add or substract similar terms: similar terms have the same variable in this case n, or don't have any variable:
[tex]7.6n-17.4[/tex]Then, the given expression simplified is 7.6n - 17.4