(x-21)+63=163           210-(60+x)=110         (132+х)+20=170;        (60+х)-10=100            (37-х)-20=10            (112-х)+30=130 ,

х=163-63+21                                     х=37-20-10 х=121                                               х=7 (121-21)+63=163                              (37-7)-20=10    х=100+10-60                                    х=170-132-20 х=50                                                х=18 (60+50)-10=100                               (132+18)+20=170   х=210-60-110                                  112-х=130-30 х=40                                                112-х=100 210-(60+40)=110                              х=112-100                                                         х=12                                                        (112-12)+30=130