To solve this problem,all you can do is simplify. First use the distributive property:
-1.5 * 4= -6
-1.5* n= -1.5n
now you should have this:
-6-1.5n+2.8
Now combine like terms:
-6+2.8= -3.2
Now you have simplified it as much as you can:
-3.2-1.5n is your answer.
