3100*20+х=62000+700
3100*20+х=62700
62000+х=62700
х=62700-62000
х=700
х+300=31*300
х+300=9300
х=9300-300
х=9000
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3100*20+х=62000+700
3100*20+х=62700
62000+х=62700
х=62700-62000
х=700
х+300=31*300
х+300=9300
х=9300-300
х=9000