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w(5)=5
w(x)=q(x)×p(x)+ax+b
p(x)=x²-8x+15
a×3+b=3 /×(-1)
a×5+b=5
-3a-b=-3
5a+b=5
2a=2
a=1
5+b=5, b=o
reszta:1×x+0=x