1.
{6x+3 < 5x+5, <=>
{-3x-15 <-2x-8, <br>
{6x-5x < 5-3,
{-3x+2x<-8+15, <=>
{x < 2,
{ -x< 7, <=>
{x < 2,
{x>-7.
S = [-7 ; 2)
2.
{7 < 2-x, <=>
{-x-9 >-2x-1,
{x < -5, <=>
{-x+2x > -1 +9,
{x < -5, <=>
{x > 8,
S = ∅
3.
{-3x-15 >-4x-9,
{-4x < 5x, <=>
{-3x + 4x > -9+15,
{-4x-5x<0, <=>
{x > 6,
{x > 0, <=>
S = [6; ∞)