( - 2 ) . ( + 4 ) : ( - 7 ) – ( - 64 ) : ( + 16 ) . ( - 1 )
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( - 2 ) . ( + 4 ) : ( - 7 ) – ( - 64 ) : ( + 16 ) . ( - 1 )
( - 2 ) * ( + 4 ) / ( - 7 ) - ( - 64 ) / ( + 16 )* ( - 1 )
( - 8 ) / ( - 7 ) - ( - 64 ) / ( + 16 )* ( - 1 )
( - 8 ) / ( - 7 ) - ( - 4 )* ( - 1 )
( - 8 ) / ( - 7 ) - ( +4) )
=8/7 -4
=8/7-28/7
=-20/7
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