Please

|10x+15|>105

        -15    -15

|10x|>90

/10    /10

x>9

What FirstLast said is true, x > 9.

Also, since it is the absolute value of 10x+15,

the other option is:

 

10x + 15 < -105

10x < -120

x < -12

 

x > 9     OR    x < -12