Розв'яжіть систему нерівностей.
239. a) {14-6x>3x+5;
{11x-3≤2x+15;
б) {3-7y>10y+3;
{5y+1,2≥6-3y;

в) {6x-5≤x;
{2(5x+7) ≥ 2x+13;

г) {2,1x-2>1,6x;
{3(x+1) ≤ 4x+2.​
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