розвяжи ривняння27:9c=15 7у+9=51 26+(72:n)=75

27:9с=15                     7у+9=51                      26+(72:н)=75
3с=15                           7у=51-9                         26+(72:н)=35
с=15:3                          7у=42                            72:н=35-26
с=5                               у=42:7                           72:н=9
27:95=15                     у=6                                н=72:9
                                     76+9=51                       н=8
                                                                          26+(72:8)=75

Решение уравнений: c = 5 y = 6 n = 8