(Х+58)-37=91 69-(у-28)=13
Х+58=91+37 у-28=69-13
Х+58=128 у-28=56
Х=128-58 у=55+28
Х=70 у=83
(70+58)-37=91 69-(83-28)=13
91=91 13=13
321+(х+13)=450 204-(х+29)=100
Х+13=450-321 х+29=204-100
Х+13=129 х+29=104
Х=129-13 х=104-29
Х=116 х=75
321+(116+13)=450 204-(75+29)=100
450=450 100=100 (Х-23)×14=56 205÷(у-27)=41
Х-23=56÷14 у-27=205÷41
Х-23=4 у-27=5
Х=4+23 у=5+27
Х=27 у=32
(27-23)×14=56 205÷(32-27)=41
56=56 41=41
89×(b+13)=7120
b+13=7120÷89
b+13=80
b=80-13
b=67
89×(67+13)=7120
7120=7120