Simplify the following expression
35+(-13)+(+)

The first step you would take would be to simplify the signs you have listed here. So, our equation would now be:
35-13+8+6
Then, we can combine like terms (positive and negatives grouped together).
49-13
Then, it is a very simple problem.
49-13=36.
The simplest form of this expression is 36.

35+(-13)+(+8)-(-6)
=35-13+8+6
=35+8+6-13
=35+14-13
=35+1
=36