391 500 + 870 *450 -(879 457 -487 957 )

Question

391 500 + 870 *450 -(879 457 -487 957 )

Answer 1

391500+870*450-(879457-487957)=391500
1)879 457 -487 957=391500
2)870*450=391500
3)391500+391500= 783000
4)783000-391500=391500