How to use row-reduce method to solve?
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Try finishing up. The idea is to make all entries 0's in each column besides the leading 1 by using the row containing the leading 1 of that column (you may want to re-read that). Usually starting from the left to the right does the job.
Didn't I solve this one already? I try to avoid fractions as much as possible . . . . . . . . .
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