Answer :
8x + 9 = 5x + 18
Subtract 9 from each side:
8x = 5x + 9
Subtract 5x from each side:
3x = 9
Divide each side by 3 :
x = 3
Subtract 9 from each side:
8x = 5x + 9
Subtract 5x from each side:
3x = 9
Divide each side by 3 :
x = 3