Răspuns :
69426-435:[363:3-(b×2+6×4)] +12345:5=71890
69426-435:[121-(2b+24)]+2469=71890
69426-435:(121-2b-24)+2469=71890
69426-435:(97-2b)+2469=71890
69426-435/97-2b+2469=71890
71895-435/97-2b=71890
-435/97-2b=71890-71895
-435/97-2b=-5
-435:(-5)= -5×(97-2b)
87=97-2b
2b= 97-87
2b= 10:2
b=5
69426-435:[121-(2b+24)]+2469=71890
69426-435:(121-2b-24)+2469=71890
69426-435:(97-2b)+2469=71890
69426-435/97-2b+2469=71890
71895-435/97-2b=71890
-435/97-2b=71890-71895
-435/97-2b=-5
-435:(-5)= -5×(97-2b)
87=97-2b
2b= 97-87
2b= 10:2
b=5
69426-435:[121-(2b+24)]+2469=71890
69426-435:[121-(2b+24)]= 69421
435:[121-(2b+24)]=5
121-(2b+24)=87
2b+24=34
2b=10
b=5
69426-435:[121-(2b+24)]= 69421
435:[121-(2b+24)]=5
121-(2b+24)=87
2b+24=34
2b=10
b=5