| x + 3 | < 2 x − 12 | − 2 x + 12 < x + 3 < 2 x − 12 {\displaystyle {\begin{aligned}&|x+3|<2x-12|\\&-2x+12<x+3<2x-12\end{aligned}}}
− 2 x + 12 < x + 3 − 3 x < − 9 x > 3 {\displaystyle {\begin{aligned}&-2x+12<x+3\\&-3x<-9\\&x>3\\\end{aligned}}}
x + 3 < 2 x − 12 − x < − 15 x > 5 {\displaystyle {\begin{aligned}&x+3<2x-12\\&-x<-15\\&x>5\\\end{aligned}}}
x + 3 > 2 x − 12 − x > − 15 x < 15 {\displaystyle {\begin{aligned}&x+3>2x-12\\&-x>-15\\&x<15\\\end{aligned}}}
x + 3 < − 2 x + 12 3 x < 9 x < 3 {\displaystyle {\begin{aligned}&x+3<-2x+12\\&3x<9\\&x<3\\\end{aligned}}}
x > 15 {\displaystyle \ x>15}
x < 15 {\displaystyle \ x<15}
x < 6 {\displaystyle \ x<6}
x < 6 ; x > 15 {\displaystyle \ x<6;x>15}