已知\(x\),\(y\)满足约束条件\(\begin{cases} & x+y-2\leqslant 0, \\ & x-2y-2\leqslant 0, \\ & 2x-y+2\geqslant 0, \\ \end{cases}\)且\(b=-2x-y\),当\(b\)取得最大值时,直线\(2x+y+b=0\)被圆\((x-1)^{2}+(y-2)^{2}=25\)截得的弦长为
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