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Question

Find x if [1 x 1]123456325123=0

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Solution

[1 x 1]123456325123=0
=[1×1+x×4+1×31×2+x×5+1×21×1+x×6+1×5]123=0
=[4+4x4+5x6+6x]123=0
=[4+4x810x+18+18x]=0
4+4x810x+18+18x=0
12x=14
x=1412=76

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