(-19)- [ -(-18)-(+7)+(-34)]=
= -19-( 18-7-34)=
= -19 - ( -23) =
= -19+23= 4
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(-19)- [ -(-18)-(+7)+(-34)]=
= -19-( 18-7-34)=
= -19 - ( -23) =
= -19+23= 4