Ответ:
900-x=200
x=900-200
x=700
---------------------
900-700=200
200=200
х=900-200
х=700
____________
700+200=900
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Ответ:
900-x=200
x=900-200
x=700
---------------------
900-700=200
200=200
х=900-200
х=700
____________
700+200=900