54у-36у-9=153 (15u-21)*3+27=234 (36t+98)\14=25 18y=153+9 45u-63=234-27 36t+98=25*14 18y= 162 45u=207+63 36t=350-98 y=162/18 45u=270 36t=252 y= 9 u=270/45 t=252/36 u=6 t=7 (12u+30u+42)\6=21 42u+42=21*6 42u= 126-42 42u= 84 u=84/42 u= 2