7x-(3+2x)=x+9 Второе 13-(2x-5)=x-3

7х-(3+2х)=х+9                     13-(2х-5)=х-3 7х-3-2х=х+9                         13-2х+5=х-3 5х-3=х+9                              18-2х=х-3 5х-х=3+9                              -2х-х=-18-3 4х=12                                   -3х=-21 х=12/4                                   х=-21/-3 х=3                                         х=7                    ответ:3                                 ответ:7