Verified answer

x-3+2x < 12

3x < 15

x<5

x-3+2x > -12

3x -3 > -12

3x > -9

x > -3

-3 < x <5

My guess is 1, since...

1-3=(-2)

2x1=2

(-2)+2=0

and 0 is definitely less than 12.