54702:9*40-(145973+712480:8)=
54702:9*40-(145973+712480:8)= 8087
1). 712480:8 = 89060
2). 145973 + 89060 = 235033
3). 54702:9 = 6078
4).6078* 40 = 243120
5). 243120 - 235033 = 8087
54702:9*40-(145973+712480:8) = 54702:9*40-(145973+89060) = 54702:9*40-235033 = 6078*40-235033 = 243120 - 235033 = 8087