69426-435:[363:3-(bx2+6x4)]+12345:5=71890
69 426-435:[121-(b×2+24)]+2 469 = 71 890
69426-435:[121-(bx2+24)] = 71 890-2 469
69426-435:[121-(bx2+24)] = 69 421
435:[121-(bx2+24)] = 69 426-69 421
435:[121-(bx24)] = 5
[121-(bx2+24)] = 435:5
121-(bx2+24) = 87
b×2+24 = 121-87
b×2+24 = 34
b×2 = 34-24
b×2 = 10
b = 10:2
b = 5
