Ответ:
х+54=59
х=59-54
х=5
х-3=9
х=9+3
х=12
645+х=675
х=675-645
х=30
х+29=34
х=34-29
х-4=8
х=4+8
45+х=75
х=75-45
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Ответ:
х+54=59
х=59-54
х=5
х-3=9
х=9+3
х=12
645+х=675
х=675-645
х=30
Verified answer
х+29=34
х=34-29
х=5
х-4=8
х=4+8
х=12
45+х=75
х=75-45
х=30