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r2+r3 =4 --------> r2=4-r3
r3+r1=5 --------> r1=5-r3
4 -r3=3-r1
-r3=3-4-5+r3
-2r3 =-6 /:(-2)
r3=3
r2=4-3 =1
r1=5-3 =2
r1=2 r2=1 r3=3