Ответ:
1)800-х=240+160
800-×=400
×=800-400
×=400
2)×-300=260+30
×-300=290
×=300+290
×=590
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Ответ:
1)800-х=240+160
800-×=400
×=800-400
×=400
2)×-300=260+30
×-300=290
×=300+290
×=590