Question

Решите плиз
Надо найти x

Answer 1

-(31/21)х + 5/7 - 1/3 = - 2 - 4/7,                                                                            -(31/21)х = - 2 - 4/7 - 5/7 + 1/3, приводим к общему знаменателю правую часть равенства,-(31/21)х = (- 2*21 - 4*3 - 5*3 + 1*7) / 21, домножим обе части уравнения на 21, получаем -31х = - 42 - 12 - 15 + 7,                                            -31х = - 62,                                                                                                                     х = 62 : 31,                                                                                                                     х = 2.