mongoDB query has got error -

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I wrote a question in mongoDB and found an error. Please help someone solve this problem: 

  & gt; Db.Accounts.update (_id: t.source, pending transactions: {$ ne: t._id}}, {$ inc: {balance: -t.value}, $ push: {pendingTransactions: t._id}}) ;   
 The error is:  
  2014-10-10T20: 27: 02.861 + 0530 Syntax error: unexpected token:   
 
 
 db.Accounts.update ( { this is unavailable ...  
  db.Accounts.update ({_id: t.source, pending transactions: {$ ne: t._id}}, {$ inc: {balance: -t.value}, $ push: {pendingTransactions : T _id}});

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