700*(83400:м)=420000
83400:м=420000:700
83400:м=600
м=83400:600
м=139
Проверка
700*(83400:139)=420000
700*600=420000
420000=420000
(n+10986)*50=589650
n+10986=589650^50
n+10986=11793
n=11793-10986
n=807
Проверка
(807+10986)*50=589650
11793*50=589650
589650=589650