(5 + x) + (5 + x + 2)=

(5 + x) + (5 + x + 2)

First, simplify 5 + x + 2 to x + 7. / Your problem should look like: 5 + x + x + 7
Second, simplify. / Your problem should look like: 5 + 2x + 7
Third, simplify. / Your problem should look like: 2x + 12

 2x + 12

(5+x)+(5+x+2)

Combine Like Terms:

=5+x+5+x+2

=(x+x)+(5+5+2)

=2x+12