1 and -1
1) Solving that inequality we have:
9(2+3x) < 72 Divide both sides by 9
(2+3x) < 8
2+3x < 8 Subtract 2 from both sides
3x < 8 -2
3x < 6
x< 2
2) Since the value of x, must be lesser than 2, then we can state that given the options, the only one that verifies this inequality is 1 and -1
3) Hence, the possible answers are 1, and -1