.
|x+2|<2x+7.
~~~~~~~~~~~~~~~~~~~~
|x+2|<2x+7.           (1)
1.  If x+2 >= 0, then  |x+2| = x+2.
    Hence, in the domain x >= -2 the inequality (1) takes the form
    x + 2 < 2x + 7,   or  2-7 < x,  which is  x > -5.
    In other words, in the domain x >= -2 the solution set is x > -5.
    Thus for the domain x > -2 the solution set is the intersection [ ,
, )  and  (
)  and  ( ,
, ), i.e.  [
), i.e.  [ ,
, ).
2.  If x+2 < 0, then  |x+2| = -(x+2).
    Hence, in the domain x < -2 the inequality (1) takes the form
    -(x + 2) < 2x + 7,   or  -x - 2 < 2x +7,  or  -2-7 < 3x,  or  -9 < 3x, which is  x > -3.
    In other words, in the domain x < -2 the solution set is x > -3.
    Thus for the domain x < -2 the solution set is the intersection (
).
2.  If x+2 < 0, then  |x+2| = -(x+2).
    Hence, in the domain x < -2 the inequality (1) takes the form
    -(x + 2) < 2x + 7,   or  -x - 2 < 2x +7,  or  -2-7 < 3x,  or  -9 < 3x, which is  x > -3.
    In other words, in the domain x < -2 the solution set is x > -3.
    Thus for the domain x < -2 the solution set is the intersection ( ,
, )  and  (
)  and  ( ,
, ), i.e.  (
), i.e.  ( ,
, ).
3.  Finally, combining these two cases, we obtain the solution set as  (
).
3.  Finally, combining these two cases, we obtain the solution set as  ( ,
, ) U [
) U [ ,
, ,  i.e.  (
,  i.e.  ( ,
, ).
).
Answer.  The solution set to inequality (1) is  ( ,
, ).
).
 
Plots y = |x+2| and y = 2x+7