Помогите решить систему
{4х-2у=-9
{3х-3у=-6

{4x-2y=-9; {-12x+6y=27 
{3x-3y=-6; {6x-6y=-12
-6x=15
x=-15/6
x=-5/2
3×(-5/2)-3y=-6
y=-1/2
(x,y)=(-5/2, -1/2)
{4×(-5/2)-2×(-1/2)=-9; {-9=-9
{3×(-5/2)-3×(-1/2/=-6; {-6=-6
(x,y)=(-5/2, - 1/2)