Question

-r + 6 +8r -14
Simplify the expressions by combining like terms?

Answer 1

                                 -r  +  6  +  8r  -  14

Add up all the 'r's:    -r + 8r  =  7r

Add up all of the
just-plain-numbers:      + 6 - 14  =   - 8

The whole messy complicated expression is the same as        7r - 8      .