Simplify the expression. (8x + 14) + (9x - 5)

Use the associative property that says

a + (b+c) = (a+b) + c

and the commutative property that says

a+b=b+a

use together and get

(8x+14) + (9x-5) = 8x+9x+14-5

add like terms

8+9=17

therefor

17x+14-5

14-5=9

17x+9 is the simpliefid form