80,5-(у-9 34)=28 56 помогите решить)))

80,5-(у-9 34)=28 56                                    80,5 = 80 5/10 = 80 1/280 1/2 - у + 9 3/4 = 28 5/6                              80 1/2 +9 3/4 =89 5/4 = 90 1/490 1/4 -у = 28 5/6у = 90 1/4 - 28 5/6                           90 1/4 - 28 5/6 = 62 + (1/4 -5/6) = 62 -7/12 = 61 5/12у = 61 5/12