express the vector x as a linear combination of the u's

u₁ =
[-2]
[0 ]
[ 1]

u₂ =
[3]
[5]
[6]

u₃ =
[-2]
[6 ]
[-4]

x =
[-13]
[ -7 ]
[-46]

O x = 4u₁ + 5u₂ - 3u₃
O x= -4u₁ - 5u₂+ 3u₃
O x= -8u₁ - 10u₂ + 6u₃
O x= 4u₁ - 10u₂ - 3u₃