Answer :

Solve for x:
6x-3 (x+8) = 9

Distribute -3 over x+8.
-3 (x+8) = -24-3x:
6x+-24-3x = 9

Grouping like terms, 6x-3x-24 = (6x-3x)-24:
(6x-3x)-24 = 9

Combine like terms in 6x-3x.
6x-3x = 3x:
3x-24 = 9

Add 24 to both sides:
3x+(24-24) = 9+24

24-24 = 0:
3x = 9+24

9+24 = 33:
3x = 33

Divide both sides of 3x = 33 by 3:
(3x)/3 = 33/3

3/3 = 1

x = 33/3 

Answer: x = 11