Довели що значення виразу -1,4(x-2)+0.7(2x-3) не залежить від значення зміною

перевести

Dear Russian Friends,

  As headteacher of  a Local State School in London, I would like to invite a group of up to 20 students and 2 teachers from your school to visit us.

I propose that you come for 15-20 days in April and that your group stays with the families of children from our school.

  Our school will be responsible for the costs of accomodation and for the educational and social programme, as agreed with our partners from your school.

                                                                                                                               Yours sincerely

                                                                                                                          Stephen Wooding