400+f/80=600
f/80=600-400
f=200*80
f=16000
проверка 400+16000/80=600
1300- (b+800)=400
1300-b-800=400
-b=400-1300+800
-b=-100
b=100
проверка 1300-(100+800)=400
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400+f/80=600
f/80=600-400
f=200*80
f=16000
проверка 400+16000/80=600
1300- (b+800)=400
1300-b-800=400
-b=400-1300+800
-b=-100
b=100
проверка 1300-(100+800)=400