Hey there! 
This seems like a 
algebraic expression
SO,
Remember: negative and negative = 
positive  positive and positive = 
positive positive and negative = 
negative negative and positive = 
negative
In
 this problem we will be doing
 negative and negative so that means our answer will be 
a negative 
Firstly, lets line up our decimals to solve this problem (once when you do that , you can solve it easier)

Answer: 
Good luck on your assignment and enjoy your day
~
