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已知函数 \( f\left(x\right)=\left\{\begin{array}{c}{2}^{x-1}-2\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ },x\le 1\\ {\mathrm{log}}_{2}\left(x+1\right)\text{ }\text{ },x>1\end{array}\right.\)，且 \( f\left(a\right)=3\)，则 \(f(6-a)=\)___.
参考答案：\(-\frac {7} {4}\)
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