Solve the System

5x1 -4x2 +2x3 +3x4 = 2
-x1 +x2 +3x3 +2x4 =3
4x1 -3x2 +5x3 +5x4 =5
3x1 -3x2 -9x3 -6x4= -9

x1= (___)+s(___)+t(___)
x2=(___)+s(___)+t(___)
x3=(___)+s(___)+t(___)
x4=(___)+s(___)+t(___)​