Question

THIS IS FOR 27 POINTS!!! EXPLAIN PLEASE!!!! Solve -9(2+a) + 4(2a+9)=11

Answer 1

So,

First you have to distribute the numbers outside of the parentheses (you multiply them with the numbers inside of the parentheses

-18+(-9a) + 8a +36=11
Then collect like terms
18-1a =11
 -18    -18
---------------------
-1a=-7
Divide both sides by -1
a=7

Answer 2

$-9(2+a) + 4(2a+9)=11\\ -18-9a+8a+36=11\\ -a=-7\\ a=7$