\frac{1}{2}} \atop {15>3x}} \right. " alt=" \left \{ {{x>\frac{1}{2}} \atop {15>3x}} \right. " align="absmiddle" class="latex-formula">
Разделим второе уравнение на 5.
\frac{1}{2},} \atop {5>x}} \right. " alt=" \left \{ {{x>\frac{1}{2},} \atop {5>x}} \right. " align="absmiddle" class="latex-formula">
Ответ: