Решите уравнения (38+b)+12=840, 14(p-30)=630, (43-s)*17=289

(38+b)+12=840                            14(p-30)=630

38 +b=840-12                              14p-420=630

38+b=828                                    14p=630+420

b=828-38                                     14p=1050

b=790                                           p=1050:14

                                                     p=75