321+(45+х)=657
321+45+х=657
366+х=657
х=657-366
х=291
Ответ:
х=-321-45+657
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321+(45+х)=657
321+45+х=657
366+х=657
х=657-366
х=291
Ответ:
321+(45+х)=657
х=-321-45+657
х=291