Question

Помогите решить уравнения 216:(16-x)=18 5y+3 (7y+18)=106 8x+4(13x+32)=308 5 (11x-31)-9x=121

Answer 1

216 : (16 - х) = 18                      5у + 3(7у + 18) = 106                          

16 - х = 216 : 18                         5у + 21у + 54 = 106

16 - х = 12                                  26у = 106 - 54

х = 16 - 12                                  26у = 52

х = 4                                            у = 52 : 26  

                                                    у = 2     

8х + 4(13х + 32) = 308                5(11х - 31) - 9х = 121

8х + 52х + 128 = 308                  55х - 155 - 9х = 121

60х = 308 - 128                           46х = 121 + 155

60х = 180                                    46х = 276 

х = 180 : 60                                  х = 276 : 46

х = 3                                             х = 6