Let 𝐴 = [ 1 − 5 − 7
−3 7 5] 𝑏 = [−2
−2], 𝑇 is defined by 𝑇(𝑥) = 𝐴𝑥. Find vector 𝑥 whose image under 𝑇 is 𝑏,
and determined whether 𝑥 is unique
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