ПОМОГИТЕ ПОЖАЛУЙСТА!!!!!!!
Решите уравнение:
(x-83)+316=425
(600-x)-92+126 
253-(X-459)=138
502-(217-x)=421        871-(X+157)=385

(х-83)+316=425                              (600-х)-92=126

х-83=425-316                                   600-х=126+92

х-82=109                                          600-х=218

х=109+82                                         х=600-218

х=191                                               х=382

253-(х-459)=138                               502-(217-х)=421

х-459=253-138                                  217-х=502-421

х-459=115                                          217-х=81

х=459+115                                         х=217-81

х=574                                                   х=136

871-(х+157)=385

х+157=871-385

х+157=486

х=486-157

х=329