Answer:
\(-2.46n+10.03\)
Step-by-step explanation:
First, you must combine (or add) like terms.
Like terms - terms that have the same variables raised to the same power.
\(5.4n-(-7)-7.86n+3.03\)
In this expression, 5.4n and -7.86n would be like terms, so we combine them. 7 and 3.03 would also be like terms.
\(5.4n+(-7.86n)=-2.46n\\7+3.03=10.03\)
The new expression and simplified would be:
\(-2.46n+10.03\)