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w(-1)=4
4=3+a-b+2
4=a-b+5
b=a+1
w(2)=20
20=-24+4a+2b+2
4a+2b=42
2b=42-4a
b=21-2a
21-2a=a+1
3a=20
a=20/3
b=23/3