42.16-42.5+42.89-1200
=42.(16-5+89)-1200
=42.100-1200
=4200-1200
=3000
42.16-42.5+42.89-1200 = -1157.45
42.16-42.5+42.89-1200
=42.(16-5+89)-1200
=42.100-1200
=4200-1200=3000
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