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3(-1)+1(2) 3(2)+1(1) 3(-3)+1.0
0(-1)+4(2) 0(2)+4(1) 0(-3) +4.0
= 5+4 10+2 -15
-3+2 6+1 -9
8 4 0
=-1 12 -15
-1 7 -9
8 4 0