-1246-(-45+(-642))+(-971)=-1246-(-46-642)-971=-1246-(-687)-971=-1246+687-971=-1530
(-589-(-990))+1983-2000+(-2020)=(-589+990)+1983-2000-2020=401+1983-2000-2020=-1636
555+(-666)-(-777)+888-999+0=555-666+777+888-999=555
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-1246-(-45+(-642))+(-971)=-1246-(-46-642)-971=-1246-(-687)-971=-1246+687-971=-1530
(-589-(-990))+1983-2000+(-2020)=(-589+990)+1983-2000-2020=401+1983-2000-2020=-1636
555+(-666)-(-777)+888-999+0=555-666+777+888-999=555