5x-18<3(x+2) , 4x-8>3x-12

[latex] left { {{5x-18 extless 3x+6} atop {4x-8 extgreater 3x-12}} ight. \ left { {{5x-3x extless 6+18} atop {4x-3x extgreater -12+8}} ight. \ left { {{2x extless 24} atop {x extgreater -4}} ight. \ left { {{x extless 12} atop {x extgreater -4}} ight. [/latex]Получаем интервал: x∈(-4; 12)