Question 136182
[ 1 -3.. 3 ]
[ 2 -5.. 4 ] 
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Subtract 2 times the 1st row from the 2nd row to get:
[ 1 -3.. 3 ]
[ 0  1.. -2] 
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Add 3 times the 2nd row to the 1st row to get:
[ 1 .0.. -3]
[ 0  1.. -2] 
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Cheers,
Stan H.