81х+67=553
81х=553-67=486
х=486/81=6
489+5с=9614
5с=9614-489=9125
с=9125/5=1825
Х*81+67=553 489+С*5=9614
81x+67=553 489+5с=9614
81x=553-67 5с=9614-489
81x=486 5с=9125
x= 486/81 с=9125/5
x=6 с=1825
81х+67=553
81х=553-67=486
х=486/81=6
489+5с=9614
5с=9614-489=9125
с=9125/5=1825
Х*81+67=553 489+С*5=9614
81x+67=553 489+5с=9614
81x=553-67 5с=9614-489
81x=486 5с=9125
x= 486/81 с=9125/5
x=6 с=1825