Помогите пожалуйста сделать 2;3

2.   19у-у+65=767                              (36+6х):24=17
       18у=767-65                                  36+6х=17*24
       18у=702                                       36+6х=408
       у=702:18                                       6х=408-36
       у= 39                                             6х=372
                                                             х=372:6
                                                             х=62


3.  445а- 278а=167а     при а=300     167*300=50100

   67х+15х+25+68=82х+93      при х=39      82*39+93=3198+93=3291