(х-300)+800=1400
Х-300+800=1400
Х=1400-800+300
Х=900
6400-(1700+y)=2500
6400-1700-у=2500
-у=2500+1700-6400
-у=-2200
У=2200
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(х-300)+800=1400
Х-300+800=1400
Х=1400-800+300
Х=900
6400-(1700+y)=2500
6400-1700-у=2500
-у=2500+1700-6400
-у=-2200
У=2200
x-300+800=1400
x=1400+300-800
x=900
6400-(1700+y)=2500
6400-1700-y=2500
-y= - 2200
y= 2200