x} \atop {20-4x>0}} \right. \\ \left \{ {{4x-x>3} \atop {-4x>-20}} \right. \\ \left \{ {{3x>3} \atop {4x<20}} \right. \\\left \{ {{x>1} \atop {x<5}} \right. \\ 1<x<5" alt=" \left \{ {{4x-3>x} \atop {20-4x>0}} \right. \\ \left \{ {{4x-x>3} \atop {-4x>-20}} \right. \\ \left \{ {{3x>3} \atop {4x<20}} \right. \\\left \{ {{x>1} \atop {x<5}} \right. \\ 1<x<5" align="absmiddle" class="latex-formula">
или x∈(1;5)