Question

I need help simplifying an expression:

(13x + 21) - (5x - 9)
______________
2

If you could walk me through the problem that would be very appreciated!

Answer 1

open the brackets then solve.

remember the flip the signs is needed.

$\frac{(13x + 21) - (5x - 9)}{2}$

$\frac{13x + 21 - 5x + 9}{2}$

$\frac{8x + 30}{2}$

= 4x + 15

Therefore the ans is 4x+15.