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![\displaystyle\ \Large \ \boldsymbol{Rules: } \\\\\\\boldsymbol{ if \ x 0 = [x]=x-\{x\}} \\\\\\\boldsymbol{if \ x [x]=x-1+\{x\}} \\\\\\then \ \ f(-5)=[-5+1]= [-4]=-4-1+0=\boxed{-5}](/tpl/images/1395/8761/99168.png)
                                                       
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