Х -100=7300-200
7300-200=7100
Х-100=7100
Х= 7100+100
Х=7200
________________
7200-100=7300-200
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X-100=7100
X=7100-100
X=7000
Х -100=7300-200
7300-200=7100
Х-100=7100
Х= 7100+100
Х=7200
________________
7200-100=7300-200