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Question

Find the solution of 7x+5y13z+4=0, 9x+2y+11z=37, 3xy+z=2 and then find x+y+z

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Solution

AX=B
75139211311xyz=4372
|A|=∣ ∣75139211311∣ ∣=406
AdjA=138812446194152231
A1=1406138812446194152231
xyz=14061388124461941522314372
xyz=132
x+y+z=6

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